Question 11 Mark
Complete the reaction equation:
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Question 21 Mark
Name the following compounds according to IUPAC system.
$\text{H}_2\text{C}=\text{CH}-\text{CH}-\text{CH}_2-\text{CH}_2-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}$
Answer
View full question & answer→Hex-1-en-3-ol.
Question 31 Mark
While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.
Answer
View full question & answer→Intramolecular H-bonding is present in o-nitrophenol. O-Nitrophenol is steam volatile because of weak intra molecular H-Bonding. In p-nitrophenol, the molecules are strongly associated due to the presence of intermolecular bonding. Hence, o-nitrophenol is steam volatile whereas p-nitrophenol is not.
Question 41 Mark
What is the structure and IUPAC name of glycerol?
Answer
View full question & answer→$\text{CH}_2\text{OH} \\ \ | \\ \text{CHOH} \\ \ | \\ \text{CH}_2\text{OH}$
IUPAC name of glycerol is Propane-1,2,3-triol.
IUPAC name of glycerol is Propane-1,2,3-triol.
Question 51 Mark
Explain why nucleophilic substitution reactions are not very common in phenols.
Question 61 Mark
Write structures of the products of the following reactions:
$\text{CH}_3-\text{CH}=\text{CH}_2\ \xrightarrow{\text{H}_2 \text{O}/\text{H}^+}$
Answer
View full question & answer→$\text{CH}_3-\text{CH}-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}$
Propane-2-ol
Question 71 Mark
Write IUPAC names of the following compound:
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}-\text{CH}-\text{C}-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\ \ \ \ \text{OH}\ \ \ \ \text{CH}_3$
Answer
View full question & answer→2, 2, 4-Trimethyl pentan-3-ol.
Question 81 Mark
Give IUPAC name of the following ether:
$\text{CH}_3\text{CH}_2\text{CH}_2\text{OCH}_3$
Answer
View full question & answer→1-Methoxypropane.
Question 91 Mark
Write IUPAC names of the following compound:
$\text{C}_6\text{H}_5-\text{O}-\text{C}_2\text{H}_5$
Answer
View full question & answer→1 -Methoxy-2-methyl propane.
Question 101 Mark
Name the alkyl halide and sodium alkoxide used to synthesise tert-butyl ethyl ether.
Answer
View full question & answer→Ethyl bromide and sodium tert-butoxide.
Question 111 Mark
Suggest a reagent for conversion of ethanol to ethanoic acid.
Answer
View full question & answer→Strong oxidizing agents such as acidified potassium permanganate are used for getting carboxylic acids from alcohols directly.
Question 121 Mark
Suggest a reagent for the following conversion.
Answer
View full question & answer→Pyridinium cholochromate (PCC), a complex of chromium trioxide with pyridine and HCl
CH3-CH-CH-CH2OH
PCC CH3-CH-CH-CHO.
CH3-CH-CH-CH2OH
PCC CH3-CH-CH-CHO.
Question 131 Mark
In Kolbe’s reaction, instead of phenol, phenoxide ion is treated with carbon dioxide. Why?
Answer
View full question & answer→Phenoxide ion is more reactive than phenol towards electrophilic substitution. The negative charge on oxygen is transferred to benzene through resonance. This helps in the attachment of Co2 which is a weak electrophilc to the benzene ring finally giving salicylic acid.
Question 141 Mark
Diethyl ether does not react with sodium.
Answer
View full question & answer→Since diethyl ether does not contain an active hydrogen attached to oxygen like alcohols and phenols, it does not react with sodium.
Question 151 Mark
What is denatured alcohol?
Answer
View full question & answer→Alcohol is made unfit for drinking by mixing some copper sulphate and pyridine to it. This process is called denaturation of alcohol and alcohol mixed with copper sulphate and pyridine is called denatured alcohol.
Question 161 Mark
Nitration is an example of aromatic electrophilic substitution and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol, which one is more easily nitrated and why?
Answer
View full question & answer→Phenol will be easily nitrated since the -OH group attached to the benzene ring activates it towards electrophilic substitution. Also, it directs the incoming group to ortho and para positions in the ring as these positions become electron rich due to the resonance effect caused by -OH group.
Question 171 Mark
Suggest a reagent for conversion of ethanol to ethanal.
Answer
View full question & answer→CrO3, pyridine and HCl (Pyridinium chlorochromate, PCC) in CH2C12.
Question 181 Mark
How are the following conversions carried out?
Methyl magnesium bromide → 2-Methylpropan-2-ol.
Question 191 Mark
Show how will you synthesise:
cyclohexylmethanol using an alkyl halide by an SN2 reaction.
Answer
View full question & answer→
Question 201 Mark
What is absolute alcohol?
Answer
View full question & answer→100% ethyl alcohol is called absolute alcohol.
Question 211 Mark
Write IUPAC names of the following compound:
$\text{HO}-\text{CH}_2-\text{CH}-\text{CH}_2-\text{OH}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}$
Answer
View full question & answer→Propane-1,2,3-triol.
Question 221 Mark
Give equation of the following reaction:
Bromine in CS2 with phenol.
Question 231 Mark
Write the equation of the reaction of hydrogen iodide with:
benzyl ethyl ether.
Question 241 Mark
Write IUPAC names of the following compound:
$\text{CH}_3-\text{CH}_2-\text{O}-\text{CH}-\text{CH}_2-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
Answer
View full question & answer→2-Ethoxy butane.
Question 251 Mark
Write IUPAC names of the following compound:
$\text{CH}_3-\text{CH}-\text{CH}-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}\ \ \ \ \ \text{OH}$
Answer
View full question & answer→Butane-2, 3-diol.
Question 261 Mark
Write chemical reaction for the preparation of phenol from chlorobenzene.
Answer
View full question & answer→Chlorobenzene is heated with 6 to 8% solution of NaOH to about 623 K under a pressure of 300 atmospheres to form sodium phenate which upon acidification with dilute HCl gives phenol as follows:
Question 271 Mark
Show how will you synthesise:
pentan-1-ol using a suitable alkyl halide?
Answer
View full question & answer→When 1-chloropentane is treated with NaOH, pentan-1-ol is produced.
$\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_2\text{Cl}+\text{NaOH}\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_2\text{OH}+\text{NaCl}\\ \text{1-Chloropentane} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Pantan-1-ol}$
Question 281 Mark
Answer the following questions:
Why are ethers insoluble in water?
Why are ethers insoluble in water?
Answer
View full question & answer→Ethers are insoluble in water because due to the bigger size of the alkyl groups, the oxygen atom in ethers fails to form intermolecular H-bonds with water.
Question 291 Mark
Write structure of the compound whose IUPAC names are as follow:
3-Chloromethylpentan-1-ol.
Answer
View full question & answer→$\text{CH}_3-\text{CH}_2-\text{CH}-\text{CH}_2-\text{CH}_2-\text{OH}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_2\text{Cl}$
Question 301 Mark
Name the alcohol that is used to make the following ester:
$ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O} \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ || \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}-\text{O}-\text{CH}-\text{CH}_3$
$ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O} \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ || \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}-\text{O}-\text{CH}-\text{CH}_3$
Answer
View full question & answer→$ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{|}\\\text{CH}_3-\text{CH}-\text{CH}_3$
Question 311 Mark
Write the IUPAC name of the compound given below.
$\text{CH}_3-\text{CH}_2-\text{C}=\text{C}-\text{OH} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ {|} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \text{CH}_2\text{OH}$
$\text{CH}_3-\text{CH}_2-\text{C}=\text{C}-\text{OH} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ {|} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \text{CH}_2\text{OH}$
Answer
View full question & answer→$\text{CH}_3-\text{CH}_2-\text{C}=\text{C}-\text{OH} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ {|} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \text{CH}_2\text{OH} \\ 3-\text{Methylpent}-2-\text{ene}-1,3-\text{diol}$
Question 321 Mark
How are the following conversions carried out?
Benzyl chloride → Benzyl alcohol.
Answer
View full question & answer→
Question 331 Mark
Name the starting material used in the industrial preparation of phenol.
Question 341 Mark
What happens when benzene diazonium chloride is heated with water?
Question 351 Mark
Write IUPAC names of the following compound:
$\text{C}_6\text{H}_5-\text{O}-\text{C}_7\text{H}_{15}(\text{n}-)$
Answer
View full question & answer→1-Phenoxy heptane.
Question 361 Mark
Write the equation of the reaction of hydrogen iodide with:
1-propoxypropane.
Answer
View full question & answer→$\text{CH}_3\text{CH}_2\text{CH}_2\text{OCH}_2\text{CH}_2\text{CH}_3\xrightarrow[373\text{K}]{\text{HI}}\text{CH}_3\text{CH}_2\text{CH}_2-\text{OH}+\text{CH}_3\text{CH}_2\text{CH}_2\text{I}\\\ \ \ \ \ \ \ \ \text{1-Propoxypropane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Propan-1-ol}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Iodopropane}$
Question 371 Mark
Which of the following is most soluble in water?
- n- butyl alcohol
- Iso-butyl alcohol
- Tertiary butyl alcohol
- None of the above
Answer
View full question & answer→- Tertiary butyl alcohol
Explanation:
Amongst isomeric alcohols, the solubility increases with branching. This is due to the reason that as the branching increases, the surface area of the non-polar hydrocarbon and the solubility increases.
So, the sequence of solubility of alcohols are
Tertiary alcohol > secondary alcohol > primary alcohol
Question 381 Mark
Write the IUPAC name of the following compounds.
- $\text{CH}_3-\text{CH}-\text{CH}-\text{CH}-\text{CH}-\text{CH}_3 \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ \ \ {|} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \ \ \text{OH} \ \ \ \ \ \text{C}_2\text{H}_5 \ \ \text{OH}$
Answer
View full question & answer→- 3-Ethyl-5-methylhexan-2,4-diol.
- 1-Methoxy-3-3nitrocyclohexan.
Question 391 Mark
Name the following compounds according to IUPAC system.
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_2\text{OH}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}-\text{CH}_2-\text{CH}-\text{CH}-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}$
Answer
View full question & answer→2, 5-Dimethylhexane-1, 3-diol.
Question 401 Mark
Predict the products of the following reactions:
$\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{O}-\text{CH}_3+\text{HBr}\xrightarrow{\ \ \ }$
Answer
View full question & answer→$\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{O}-\text{CH}_3+\text{HBr}\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{CH}_3-\text{CH}_2-\text{CH}_2\text{OH}+\text{CH}_3-\text{Br}\\\\ \ \ \ \ \ \ \text{n-Propylmethyl ether}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Propanol}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Bromomethane}$
Question 411 Mark
Alcohol can be dehydrated by:
- (CH3CO)2O
- (CH3)2SO4
- HI/P
- AnhyZnCl2/$\Delta$
Answer
View full question & answer→- AnhyZnCl2/$\Delta$
Explanation:
$\text{R}-\text{CH}_2-\text{OH}\xrightarrow{\text{Anhy Zncl}_2{\Delta}}\text{R}=\text{CH}_2$
Question 421 Mark
Give the major products that are formed by heating the following ethers with HI.
$ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{|}\\\text{CH}_3-\text{CH}_2-\text{CH}-\text{CH}_2-\text{O}-\text{CH}_2-\text{CH}_3$
$ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{|}\\\text{CH}_3-\text{CH}_2-\text{CH}-\text{CH}_2-\text{O}-\text{CH}_2-\text{CH}_3$
Answer
View full question & answer→$\text{CH}_3-\text{CH}_2-\text{CH}-\text{CH}_2\text{OH}+\text{CH}_3\text{CH}_2\text{I} \ \ \ \ \ \ \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{|}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
Question 431 Mark
Explain why sodium metal can be used for drying diethyl ether but not ethyl alcohol.
Answer
View full question & answer→Due to presence of an active hydrogen atom, ethyl alcohol reacts with sodium metal.
$2\text{CH}_3-\text{CH}_2-\text{OH}+2\text{Na}\rightarrow2\text{CH}_3-\text{CH}_2-\text{ONa}+\text{H}_2$
Diethyl ether, on the other hand, does not have replaceable hydrogen atom therefore does not react with sodium metal hence can be dried by metallic sodium.
$2\text{CH}_3-\text{CH}_2-\text{OH}+2\text{Na}\rightarrow2\text{CH}_3-\text{CH}_2-\text{ONa}+\text{H}_2$
Diethyl ether, on the other hand, does not have replaceable hydrogen atom therefore does not react with sodium metal hence can be dried by metallic sodium.
Question 441 Mark
How are the following conversions carried out?
Propene → Propan-2-ol.
Answer
View full question & answer→If propene is allowed to react with water in the presence of an acid as a catalyst, then propan-2-ol is obtained.
$\text{CH}_3-\text{CH}=\text{CH}_2+\text{H}_2\text{O}\stackrel{{\text{H}^{+}}}{{\rightleftharpoons}}\text{CH}_3-\text{CH}-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}\\ \text{Propene}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Propan-2-ol}$
$\text{CH}_3-\text{CH}=\text{CH}_2+\text{H}_2\text{O}\stackrel{{\text{H}^{+}}}{{\rightleftharpoons}}\text{CH}_3-\text{CH}-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}\\ \text{Propene}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Propan-2-ol}$
Question 451 Mark
Explain why is OH group in phenols more strongly held as compared to OH group in alcohols.
Answer
View full question & answer→In phenols, the -OH group is attached to sp2 hybridised carbon of an aromatic ring. The carbon- oxygen bond length (136 pm) in phenol is slightly less than that in methanol. This is due to partial double bond character on account of the conjugation of unshared electron pair of oxygen with the aromatic ring whereas in alcohols, the oxygen of the -OH group is attached to carbon by a sigma bond formed by the overlap of a sp3 hybridised orbital of carbon with a sp3 hybridised orbital of oxygen. That is why -OH group in phenol is more strongly held as compared to alcohol.
Question 461 Mark
How can propan-2-one be converted into tert- butyl alcohol?
Answer
View full question & answer→$\ \ \ \ \ \ \ \ \ \ \ \ \ \text{O} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \\ \ \ \ \ \ \ \ \ \ \ \ \ \ {||} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \\ \text{CH}_3 - \text{C} - \text{CH}_3 + \text{CH}_3\text{MgI}\xrightarrow{\text{Ether}}\text{CH}_3-\text{C}-\text{CH}_3\xrightarrow[\text{H}]{\text{H}_2\text{O}}\text{CH}_2-\text{C}-\text{CH}_3+\text{Mg(I)OH} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {|} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Addition Product} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{teri-Butyl alcohol} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (2-\text{Methylpropan}-2-\text{Ol})$
Question 471 Mark
What is the order of dehydration of primary, secondary and tertiary alcohols?
Answer
View full question & answer→Tertiary alcohols > Secondary alcohols > Primary alcohols.
Question 481 Mark
Arrange the following compounds in decreasing order of acidity.
$\text{H}_2\text{O}, \text{ROH}, \text{HC}\equiv \text{CH}$
$\text{H}_2\text{O}, \text{ROH}, \text{HC}\equiv \text{CH}$
Answer
View full question & answer→$\text{H}_2\text{O}> \text{ROH} > \text{HC}\equiv \text{CH}$
Question 491 Mark
Dipole moment of phenol is smaller than that of methanol. Why?
Answer
View full question & answer→Due to electron withdrawing effect of phenyl group, the C-O bond in phenol is less polar, whereas in case of methanol the methyl group has electron releasing effect and hence C-O bond in it is more polar. Dipole moment depends upon the polarity of bonds.
Question 501 Mark
Methyl alcohol is industrially prepared by the action of?
- CH3COCH3
- CO + H2
- CH3COOH
- C2H5OH
Answer
View full question & answer→- CO + H2
Explanation:
The industrial method of preparation of methanol or methyl alcohol is by the action of CO+H2 as:
CO + H2 → CH3OH (230−400°C)
Carbon monoxide reacts with hydrogen to produce methanol/methyl alcohol.
This reaction takes place at a temperature of 230−400°C and at 50-100 atm. In this reaction, the catalyst is can be copper oxide on oxide chromium(III).