Consider the following set of reactions. What are $A$ and $B$ respectively?
$Y \xleftarrow{B} C_6H_5CN \xrightarrow{A} X$
($Y$ reacts with $2,4-DNP$)
($X$ dissolves in dil. $HCl$)

  • A
    $LiAlH_4, H_2O \quad ; H_2 / Ni$
  • B
    $Na / Hg, C_2H_5OH \quad ; DIBAL-H, H_2O$
  • C
    $DIBAL-H, H_2O \quad ; LiAlH_4, H_2O$
  • D
    $Na / Hg, C_2H_5OH \quad ; H_2 / Ni$

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