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CBSE Class 12 · 2022 · Aldehydes Ketones and Carboxylic AcidsShort Answer

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Arrange the following in increasing order of the property indicated:
a) ethanal, propanone, propanal, butanone (reactivity towards nucleophilic addition)
b) 4-nitrobenzoic acid, benzoic acid, 3,4-dinitrobenzoic acid, 4-methoxybenzoic acid (acid strength)

Solution

(a) Nucleophilic addition falls with +I donation and steric bulk at the carbonyl:

(b) Electron-withdrawing –NO strengthens, donating –OCH weakens the acid:

CBSE Class 12 Board · 2022 · Subjective

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