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Aldehydes, Ketones and Carboxylic Acids · Question 78

AIPMT 2000MCQEasy📈 Topic in 0% papers+4−1
1

Benzoic acid may be converted into ethyl benzoate by reaction with :

  1. ethyl alcohol
  2. ethyl alcohol and dry HCl
  3. ethyl chloride
  4. sodium ethoxide.

Answer

(2) ethyl alcohol and dry HCl

Solution

∵ As per NCERT, carboxylic acids are esterified by heating with alcohols in the presence of a mineral acid such as conc. H2SO4 or dry HCl gas as catalyst (Fischer esterification).

C6H5COOH + C2H5OH dry HCl C6H5COOC2H5 + H2O

Ethyl alcohol alone reacts too slowly, and sodium ethoxide only forms the salt C6H5COONa.

∴ Ethyl alcohol and dry HCl convert benzoic acid into ethyl benzoate.

Answer: (2)

AIPMT 2000

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

Reduction by LiAlH4 of hydrolysed product of an ester gives

  1. two alcohols
  2. two aldehydes
  3. one acid and one alcohol
  4. two acids.
AIPMT 2000

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