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Chemistry · 2026 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsPhysical Properties of Aldehydes, Ketones and Carboxylic Acids3 marksUnderstandshort answer
CBSE 2026 · Region 1 · Set 1 · Q26
Give reasons for the following: (a) Carboxylic acids have higher boiling point than alcohols of comparable molecular masses. (b) Alpha ( α )…
Give reasons for the following :
(a)
Carboxylic acids have higher boiling point than alcohols of comparable molecular masses.
(b)
Alpha ( $\displaystyle \alpha$ ) hydrogens of aldehydes and ketones are acidic in nature.
(c)
Nucleophilic addition of ammonia and its derivatives does not occur with carbonyl group in strongly acidic medium.
Marking-scheme solution
(a)
Due to extensive association of carboxylic acid molecules through
intermolecular hydrogen bond./ Dimer formation takes place
(b)
Due to the strong electron withdrawing effect of the carbonyl group /
resonance stabilisation of their conjugate base.
(c)
Protonation of nucleophile takes place in strongly acidic medium.
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.