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Chemistry Assertion (A) & Reason (B) MCQ [1M]

Amines · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 24 questions.

Questions

Assertion (A) & Reason (B) MCQ [1M]

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24 questions · timed · auto-graded

Question 11 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Aniline does not undergo Friedel-Crafts reaction.
Reason: -NH2 group of aniline reacts with AICl3.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
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Question 21 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Boiling point of amines are lower than those of alcohols and carboxylic acids.
Reason: Amines are much more soluble in water than less polar solvents like alcohol, ether, etc.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

It is because hydrogen bonding is less pronounced in primary and secondary amines than that in alcohols or carboxylic acids and nitrogen is less electronegative than oxygen.

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Question 31 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Nitration of aniline can be done conveniently by protecting the amino group by acetylation.
Reason: Acetylation increases the electron density in the benzene ring.
Answer
  1. Assertion is correct statement but reason is wrong statement.

Explanation:

Acetylation decreases the electron density in the benzene ring and deactivate the ring hence control the reaction.

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Question 41 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Ammonolysis of alkyl halides involves the reaction between alkyl halides and alcoholic ammonia.
Reason: Reaction can be used to prepare 1º, 2º, 3º amines and finally quaternary ammonium salts.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
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Question 51 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Ammonia is more basic than water.
Reason: Nitrogen is less electronegative than oxygen.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:

Ammonia is more basic than water. It is because nitrogen being less electronegative than oxygen, has a greater tendency to donate electrons.

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Question 61 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Me3N reacts with BF3 whereas Ph3N does not.
Reason: The electron pair on nitrogen atom in Ph3N is delocalised in the benzene ring and is not available for boron in BF3.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
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Question 71 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: p-Anisidine is weaker base than aniline.
Reason: OCH3 group in anisidine exerts +R effect.
Answer
  1. Assertion is wrong statement but reason is correct statement.

Explanation:

p-Anisidine is a stronger base than aniline. -OCH3 group in anisidine exerts +R-effect.

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Question 81 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Aniline is a weaker base than cyclohexylamine.
Reason: Aniline undergoes halogenation even in the absence of a catalyst.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

Aniline exists as resonance hybrid. As a result of resonance, the lone pair of electrons on nitrogen gets delocalized over the benzene ring and thus, is less easily available for protonation than in case of cyclohexylamine where no such resonance takes place.

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Question 91 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: In order to convert R-CI to pure R-NH2, Gabriel pthalimide synthesis can be used.
Reason: With proper choice ofalkyl halides, pthalimide synthesis can be used to prepare 1º, 2º or 3º amines.
Answer
  1. Assertion is correct statement but reason is wrong statement.

Explanation:

Only primary aliphatic amines can be prepared by Gabriel phthalimide reaction.

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Question 101 Mark
Note: In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are wrong.
  2. Both assertion and reason are correct statements but reason is not correct explanation of assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
  5. Assertion is wrong statement but reason is correct statement.
Assertion: Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product.
Reason: Acyl group sterically hinders the approach of further acyl groups.
Answer
  1. Assertion is correct statement but reason is wrong statement.

Explanation:

Amines on acetylation give monosubstituted product, while on alkylation gives polysubstitution product as well.

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Question 111 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Aniline is a weaker base than ethylamine.
Reason: Aniline is a weaker base than ethylamine.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

The lone pair of electrons on the N-atom in aniline is delocalized over the benzene ring and is less easily available for protonation. Therefore, aniline is a weaker base than ethylamine.

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Question 121 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: In Hoffmann bromamide reaction, the amine formed has one carbon atom less than the parent 1° amide.
Reason: N-methyl acetamide undergoes Hoffmann bromamide reaction.
Answer
  1. Assertion is correct statement but reason is wrong statement.

Explanation:

Only primary amines can be prepared from amides (RCONH2) by treating with Br2 and KOH. Thus, N-methyl acetamide i.e., CH3CONHCH3 does not undergo Hoffmann bromamide reaction.

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Question 131 Mark
Note: In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are wrong.
  2. Both assertion and reason are correct statements but reason is not correct explanation of assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
  5. Assertion is wrong statement but reason is correct statement.
Assertion: Hoffmann’s bromamide reaction is given by primary amines.
Reason: Primary amines are more basic than secondary amines.
Answer
  1. Both assertion and reason are wrong.

Explanation:

Hofmann’s bromamide reaction is given by amides, not by amines. Moreover, primary amines are basic than secondary amines.

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Question 141 Mark
Note: In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are wrong.
  2. Both assertion and reason are correct statements but reason is not correct explanation of assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
  5. Assertion is wrong statement but reason is correct statement.
Assertion: Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap and HCl in the presence of steam.
Reason: FeCl2 formed gets hydrolysed to release HCl during the reaction.
Answer
  1. Both assertion and reason are correct statements and reason is correct explanation of assertion.

Explanation:

Fe + 2HCl → FeCl2 + 2[H]

Nascent hydrogen reduces nitro compounds.

FeCl2 + H2O(g) → FeO + 2HCl

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Question 151 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: In ammonolysis, the order of reactivity of halides with amines is R-1 < R-Br > R-CI.
Reason: Ammonolysis is a nucleophilic substitution reaction.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
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Question 161 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Ortho substituted anilines are usually weaker bases than anilines.
Reason: This is due to ortho effect.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:

Ortho effect is a consequence of steric and electronic factors.

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Question 171 Mark
Note: In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are wrong.
  2. Both assertion and reason are correct statements but reason is not correct explanation of assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
  5. Assertion is wrong statement but reason is correct statement.
Assertion: Aromatic 1° amines can be prepared by Gabriel Phthalimide Synthesis.
Reason: Aryl halides undergo nucleophilic substitution with anion formed by phthalimide.
Answer
  1. Both assertion and reason are wrong.

Explanation:

Aromatic amines are never obtained by Gabriel phthalimide synthesis.

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Question 181 Mark
Note: In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are wrong.
  2. Both assertion and reason are correct statements but reason is not correct explanation of assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
  5. Assertion is wrong statement but reason is correct statement.
Assertion: N-Ethylbenzene sulphonamide is soluble in alkali.
Reason: Hydrogen attached to nitrogen in sulphonamide is strongly acidic.
Answer
  1. Both assertion and reason are correct statements and reason is correct explanation of assertion.

Explanation:

$\text{C}_2\text{H}_5-\text{N}-\text{SO}_2\text{C}_6\text{H}_5+\text{NaOH}\xrightarrow{\ \ \ \ }\text{C}_2\text{H}_5-\stackrel{{\ \ \ \text{Na}^+}}{\hbox{N}}-\text{SO}_2\text{C}_6\text{H}_5+\text{H}_2\text{O}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Soluble salt}\\\ \ \ \ \ \ \ \text{Ethylbezene sulphonamide}$

Ethylbenzene sulphonomide is soluble in alkali because it has acidic hydrogen.

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Question 191 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.

Assertion: Controlled nitration of aniline at low temperature mainly gives m-nitroaniline.

Reason: In acidic medium, -NH2 group gets converted into m-directing group.

Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:

Under acidic condition, aniline gets protonated to anilinium ion $(\text{NH}^+_3\text{ group})$ This is deactivating and m-directing group. Thus, controlled nitration of aniline mainly gives m-nitroaniline.

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Question 201 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: In strongly acidic solutions, aniline becomes more reactive towards electrophilic reagents.
Reason: The amino group being completely protonated in strongly acidic solution, the lone pair of electrons on the nitrogen is no longer available for resonance.
Answer
  1. Assertion is wrong statement but reason is correct statement.

Explanation:

In strongly acidic medium, aniline gets protonated and so the lone pair of electrons is not available to produce +E or + M effects. On the other hand, the $-\stackrel{+}{\hbox{N}}\text{H}_3$ group exerts strong -I effect and thus it causes the deactivation of the ring. 


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Question 211 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Carbylamine reaction involves the reaction between 1º amine and chloroform in basic medium.
Reason: In carbylamine reaction, -NH2 group is converted into - NC group.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:

$\text{RNH}_2+\text{CHIl}_3+3\text{KOH}(\text{alc})\rightarrow\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{R}-\text{N}\equiv\text{C}+3\text{KCl}+3\text{H}_2\text{O}$

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Question 221 Mark
Note: In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are wrong.
  2. Both assertion and reason are correct statements but reason is not correct explanation of assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
  5. Assertion is wrong statement but reason is correct statement.
Assertion: N, N-Diethylbenzene sulphonamide is insoluble in alkali.
Reason: Sulphonyl group attached to nitrogen atom is strong electron withdrawing group.
Answer
  1. Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Explanation:

N, N-diethyl benzene sulphonamide is insoluble in alkali because it has no acidic hydrogen. Sulphonyl group attached to nitrogen atom is electron withdrawing group.

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Question 231 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Aniline hydrogen sulphate, on heating, forms p-aminosulphonic acid.
Reason: The sulphonic acid group is electron-withdrawing.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

-NH2 being o,p-directing group directs -SO3H group to less hindered p-position.

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Question 241 Mark
Note: In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are wrong.
  2. Both assertion and reason are correct statements but reason is not correct explanation of assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
  5. Assertion is wrong statement but reason is correct statement.
Assertion: Acetanilide is less basic than aniline.
Reason: Acetylation of aniline results in decrease of electron density on nitrogen.
Answer
  1. Both assertion and reason are correct statements and reason is correct explanation of assertion.

Explanation:

Acetanilide is less basic than aniline because electron density of nitrogen is lowered by acetyl group.

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Assertion (A) & Reason (B) MCQ [1M] - Chemistry STD 12 Science Questions - Vidyadip