The conversion, $P h C N ⟶ P h C O {C H}_{3}$ , can be achieved most conveniently by reaction with

{C H}_{3} M g B r

followed by hydrolysis

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I_{2} - N a O H, {C H}_{3} I

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dil.

H_{2} {S O}_{4}

followed by reaction with

{C H}_{2} N_{2}

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L A H

followed by reaction with

{C H}_{3} I

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Solution

The correct option is A ${C H}_{3} M g B r$ followed by hydrolysis
Ketones can be best prepared by the action of Grignard reagent on nitriles followed by hydrolysis.

$P h C N C H_{3} M g B r - ----- \to P h C (C H_{3}) = N M g B r H_{3} O^{+} - -- \to P h C O C H_{3} + N H_{3} + H O - M g - B r$
Option A is the correct answer.

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P h C N \to P h C O C H_{3}

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