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An unknown aldehyde A on reaction with a...

An unknown aldehyde A on reaction with alkali gives a `beta`- hydroxy aldehyde, which loses water to form an unsaturated aldehyde, But-2-enal. Another aldehyde 'B' undergoes disproportionation reaction in the presence of conc. alkali to form products C and D. C is an aryl alcohol with the formula `(C_(7)H_(8)O)`
(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.

Text Solution

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(i) The Aldehyde compound .A. on reaching with alkali gives a ` beta `- hydroxy aldehyde which loses water to form unsaturated aldehyde , but -2-enal . This is aldol condensation reactiom
(ii ) The aldehyde compound B undergoes disproportionation reaction with conc . This is cannizzaro.s reaction
(iii ) the product .C. is an aryl alcohol with formula `C_7 H_8 O`. it must be ` C_6 H_5 CH_2 OH ` and is formed by condensation of benzaldehyde thus
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