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8.2 Carboxylic acids and their derivative — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry8.2 Carboxylic acids and their derivative1 Mark
MCQ
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A:$ A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene.

Reason $R:$ Benzoic acid is soluble in hot water.

In the light of the above statements, choose the most appropriate answer from the options given below.

  • A
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
  • B
    Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$.
  • C
    $A$ is true but $R$ is false.
  • ✓
    $A$ is false but $R$ is true.
✓

Answer

Correct option: D.
$A$ is false but $R$ is true.
d
Benzoic acid and Napthalene can be effectively separated by crystallization. Benzoic acid is soluble in hot water whereas Napthalene is insoluble.

Hence assertion is incorrect but reason is correct.

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