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Chemistry · 2026 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids3 marksApplyshort answer
CBSE 2026 · Region 5 · Set 1 · Q28
(a) (i) Arrange the following compounds in increasing order of their acidic strengths: (ii) Why is CH_3 CHO more reactive than acetone towards…
(i)
Arrange the following compounds in increasing order of their acidic strengths :
(ii)
Why is $\displaystyle \mathrm{CH}_{3} \mathrm{CHO}$ more reactive than acetone towards reaction with HCN ?
(iii)
Complete the equation :
An organic compound with the molecular formula $\displaystyle \mathrm{C}_{8} \mathrm{H}_{8} \mathrm{O}$ forms $\displaystyle 2,4$-DNP derivative, reduces Tollens' reagent and undergoes Cannizzaro reaction. On vigorous oxidation it gives Benzene-$\displaystyle 1,2$-dicarboxylic acid. Identify the compound and write the reactions of compound $\displaystyle 2,4$-DNP and when it undergoes Cannizzaro reaction.
Marking-scheme solution
(i)
(ii)
Due to steric hindrance and electronic effect / The presence of two methyl
groups in acetone hinders the approach of nucleophile to carbonyl carbon than in
ethanal having one methyl group.
(iii)
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