An unknown aldehyde 'A' on reacting with alkali gives a b-hydroxy-aldehyde, which loses water to form an unsaturated aldehyde, 2 - butenal. Another aldehyde 'B' undergoes disporportionation reaction in the presence of conc. alkali to form products C and D. C is an aryl alcohol with formula C_7H_8O . (i) Identify A and B. (ii) Write the sequence of reactions involved (iii) Name the product, when 'B' reacts with Zn amalgam and hydrochloric acid.

An unknown aldehyde 'A' on reacting with alkali gives a b-hydroxy-alde

1.	An unknown aldehyde 'A' on reacting with alkali gives a b-hydroxy-aldehyde, which loses water to form an unsaturated aldehyde, 2 - butenal. Another aldehyde 'B' undergoes disporportionation reaction in the presence of conc. alkali to form products C and D. C is an aryl alcohol with formula C_7H_8O . (i) Identify A and B. (ii) Write the sequence of reactions involved (iii) Name the product, when 'B' reacts with Zn amalgam and hydrochloric acid.
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