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CBSE Class 12 · 2002 · All India · Aldehydes Ketones and Carboxylic AcidsShort Answer

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Give one test each to distinguish between:
i) aqueous solutions of acetaldehyde and acetone
ii) aqueous solutions of phenol and benzoic acid
iii) aqueous solutions of formaldehyde and acetaldehyde

Solution

(i) Tollens' reagent — acetaldehyde deposits a silver mirror, acetone does not.
(ii) NaHCO — benzoic acid gives CO effervescence; phenol does not (and phenol alone turns FeCl violet).
(iii) Iodoform test — acetaldehyde (CHCHO) gives yellow CHI; formaldehyde, lacking the CHCO– unit, does not.

CBSE Class 12 Board · 2002 · All India · Subjective

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