MCQ
.
  • A


  • C

  • D

Answer

Correct option: B.

b
$\mathop {{\text{Ph}} - {\text{CN}}}\limits_{(A)} $        $\mathop {{\text{Ph - CHO}}}\limits_{(B)} $         $\mathop {{\text{Ph}} - {\text{CH}} = {\text{CH}} - {\text{COOH}}}\limits_{(C)} $

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