In the following reaction sequence,$X$ and $Y$ are:

  • A
    $R CdCl$ & $R^{\prime} COCl$
  • B
    $R_2 Cd$ & $(R^{\prime} CO)_2$
  • C
    $R_2 Cd$ & $R^{\prime} COCl$
  • D
    $R_2 MgCdCl_2$ & $R COO R^{\prime}$

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