CBSE 2024 · Region 1 · Set 2 · Q14 · 1 mark
Assertion (A) : The $\displaystyle \mathrm{pK}_{\mathrm{a}}$ of $\displaystyle \mathrm{O}_{2} \mathrm{~N}-\mathrm{CH}_{2}-\mathrm{COOH}$ is lower than that of $\displaystyle \mathrm{CH}_{3}-\mathrm{COOH}$. Reason $\displaystyle (R)$ : $\displaystyle -\mathrm{NO}_{2}$ group shows electron withdrawing effect which increases the acidic character of $\displaystyle \mathrm{O}_{2} \mathrm{~N}-\mathrm{CH}_{2}-\mathrm{COOH}$.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Aldehydes, Ketones and Carboxylic AcidsNomenclature and Structure of Carboxyl GroupUnderstandassertion_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.