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Chemistry · 2025 · 2 marks
Aldehydes, Ketones and Carboxylic AcidsMethods of Preparation of Carboxylic Acids2 marksUnderstandvery short answer
CBSE 2025 · Region 5 · Set 3 · Q21
(a) Carboxylic acid is more acidic than phenol. Give reason. (b) Give a chemical test to distinguish between benzaldehyde and acetophenone.
(a)
Carboxylic acid is more acidic than phenol. Give reason.
(b)
Give a chemical test to distinguish between benzaldehyde and acetophenone.
Marking-scheme solution
(a)
In carboxylate ion, the negative charge is delocalized over two electronegative
oxygen atoms, hence carboxylate ion is more stable than phenoxide ion./Due to two
equivalent resonating structures of carboxylate ion.
(b)
(a)
Add NaOH and iodine to both the compounds and heat, acetophenone gives
yellow ppt of iodoform (CHI3 ),whereas Benzaldehyde does not.
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.