Q35 / 180 · AIIMS 2009 · Chemistry

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

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • Correct answer
    C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

It is known that esters with $\alpha$-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 $\beta$-keto ester. $\mathrm{LiAlH}_4$ reduces esters to alcohols.

Hence, the correct answer is option: 'C'.

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