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Chemistry · 2025 · 5 marks
Aldehydes, Ketones and Carboxylic AcidsMethods of Preparation of Carboxylic Acids5 marksUnderstandlong answer
CBSE 2025 · Region 6 · Set 1 · Q33
(a) (i) Identify A, B and C in the following reactions: (ii) Give reasons for the following: (I) Carboxylic acids do not give the characteristic…
(i)
Identify A, B and C in the following reactions :
(ii)
Give reasons for the following:
(I)
Carboxylic acids do not give the characteristic reactions of carbonyl group.
(II)
Ethanoic acid is a stronger acid than ethanol.
(i)
Write the product (s) in the following reactions:
(I)
$\displaystyle 2 \mathrm{CH}_{3} \mathrm{COOH} \xrightarrow[\text { heat }]{\mathrm{P}_{4} \mathrm{O}_{10}}$
(II)
(III)
(ii)
Write the reaction involved in the following reactions:
(I)
Wolff-Kishner Reduction
(II)
Decarboxylation Reaction
Marking-scheme solution
(i)
A=
B=
C=
(ii)
(I)
Because carbon of carboxyl group is less electrophilic due to resonance with -OH group.
(II)
Because ethanoate ion is more stable than ethoxide ion due to resonance.
i)
(I)
/ (CH3CO)2O
(II)
(III)
(ii)
(I)
(II)
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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.