Identify (A) and (B) in the given sequence of reaction $P h C H_{2} C H O S e O_{2} \to (A) (i) c o n . O H^{-} - ------ \to (i i) H^{+}$ (B)

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Solution

Phenylacetaldehyde reacts with selenium dioxide to produce phenylglyoxal. After treatment of water to form alcohol.

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(A)

(B)

S n C l_{2} + 2 N a O H \to (A) (w h i t e p p t) N a O H - --- \to (e x c e s s) (B)

C_{2} H_{6} A \to C_{2} H_{5} C l Z n / T H F - ---- \to B

N a_{2} C O_{3} S O_{2} - - \to (A) N a_{2} C O_{3} - ---- \to (B) S \to (C) A g N O_{3} - --- \to (D)

^{'} A^{'},^{'} B^{'}

^{'} C^{'}

^{'} A^{'} N a O H / C a O - ------ \to Δ^{'} B^{'} B r_{2} / A l B r_{3} - ----- \to Δ^{'} C^{'} N a / d r y e t h e r - ------- \to Δ n - B u t a n e

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