Which of the following reactions is not correct?

  • A
    $CH_2Br-CH_2Br \xrightarrow{Zn} CH_2=CH_2$
  • B
    $CH_3-C \equiv C-CH_3 \xrightarrow{H_2, Pd/BaSO_4} cis-CH_3-CH=CH-CH_3$
  • C
    $CH_3-C \equiv CH \xrightarrow{Hg^{2+}, H^+} CH_3-CH_2-CHO$
  • D
    $2Ph-CH_2-Br \xrightarrow{Na, \text{dry ether}} Ph-CH_2-CH_2-Ph + 2NaBr$

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In the reaction sequence:
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