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AIIMS 2009
Exam
AIIMS
Year
2009
Subject
Chemistry
Chapter
Carboxylic Acid Derivatives

AIIMS 2009 · Chemistry · Carboxylic Acid Derivatives

Assertion : Esters which contain α -hydrogens undergo Claisen...

Assertion : Esters which contain α\alpha-hydrogens undergo Claisen condensation. Reason : LiAlH4\mathrm{LiAlH}_4 reduction of esters gives acids.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

It is known that esters with α\alpha-hydrogens form carbanion when treated with base. It brings about nucleophilic substitution at the carbonyl group of the other molecule of the ester to yield β\beta-keto ester. LiAlH4\mathrm{LiAlH}_4 reduces esters to alcohols.
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