CBSE Class 12 · 2011 · Foreign · Aldehydes Ketones and Carboxylic AcidsShort Answer

State:
i) why benzaldehyde does not undergo aldol condensation;
ii) how an acid amide may be converted to the parent acid.

Solution

(i) Aldol condensation needs an α-H to form the enolate; in C

_{6}

_{5}

CHO the α-position is the ring — no α-H, so no aldol (it does Cannizzaro instead).
(ii)

RCON H_{2} + H_{2} O H^{+}, Δ RCOOH + N H_{4}^{+}

(or via HNO

_{2}

CBSE Class 12 Board · 2011 · Foreign · Subjective