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CBSE Class 12 · 2011 · Delhi · Aldehydes Ketones and Carboxylic AcidsLong Answer

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i) Give chemical tests to distinguish between:
a) propanal and propanone b) benzaldehyde and acetophenone
ii) How would you obtain:
a) but-2-enal from ethanal b) butanoic acid from butanal c) benzoic acid from ethylbenzene?

Solution

(i)(a) Propanal → silver mirror with Tollens'; propanone → none.
(b) Acetophenone → yellow CHI (iodoform); benzaldehyde → Tollens' mirror instead.
(ii)(a)

(b)

(c)

CBSE Class 12 Board · 2011 · Delhi · Subjective

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