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ICSE Class 10 Chemistry Question 28 of 93

Organic Chemistry — Question 23

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Question 23

Assertion (A): Carboxylic acids react with alcohol in presence of concentrated H2SO4 to produce a fruity smell.

Reason (R): It is due to the formation of an aldehyde.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
Answer

A is true but R is false.

Explanation— Carboxylic acids like ethanoic acid react with alcohol in presence of dehydrating agent, concentrated H2SO4 to produce a ester with pleasant fruity smell. This reaction is know as reaction of esterification. Hence, the assertion (A) is true.

C2H5OHethyl alcohol+CH3COOHacetic acid→Conc. H2SO4CH3−COO−C2H5ethyl acetate+H2O\underset{\text{ethyl alcohol}}{\text{C}_2\text{H}_5\text{OH}} + \underset{\text{acetic acid}}{\text{CH}_3\text{COOH}} \xrightarrow{\text{Conc. H}_2\text{SO}_4} \underset{\text{ethyl acetate}}{\text{CH}_3-\text{COO}-\text{C}_2\text{H}_5} + \text{H}_2\text{O}

The pleasant fruity smell is due to the formation of ester not aldehyde. Hence, the reason (R) is false.