Identify $Z$ in the following reaction sequence:
${C_2}{H_5}I$ $\xrightarrow{Alc. KOH} X$ $\xrightarrow{Br_2} Y$ $\xrightarrow{KCN} Z$

  • A
    $NC-CH_2-CH_2-CN$
  • B
    $CH_3-CH_2-CN$
  • C
    $Br-CH_2-CH_2-CN$
  • D
    $Br-CH=CH-CN$

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