$R-CH_2-CCl_2-R \xrightarrow{\text{Reagent}} R-C \equiv C-R$
The reagent is

  • A
    $Na$
  • B
    $HCl \text{ and } H_2O$
  • C
    $KOH \text{ in } C_2H_5OH$
  • D
    $Zn$

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