CBSE 2024 · Region 1 · Set 1 · Q15 · 1 mark
Assertion (A) : The $\displaystyle \mathrm{pK}_{\mathrm{a}}$ of ethanoic acid is lower than that of $\displaystyle \mathrm{Cl}-\mathrm{CH}_{2}-\mathrm{COOH}$.
Reason (R) : Chlorine shows electron withdrawing (-I) effect which increases the acidic character of $\displaystyle \mathrm{Cl}-\mathrm{CH}_{2}-\mathrm{COOH}$.
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Assertion (A) is false, but Reason (R) is true.
Aldehydes, Ketones and Carboxylic AcidsNomenclature and Structure of Carboxyl GroupAnalyseassertion_reasonmedium
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CBSE Class 12 Chemistry past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.