Which of the following reactions is Rosenmund reduction?

  • A
    $R-COCl + H_2 \xrightarrow{Pd-BaSO_4} R-CHO + HCl$
  • B
    $R-CN \xrightarrow{SnCl_2, HCl} R-CHO + NH_4Cl$
  • C
    $R-CHO \xrightarrow{Zn-Hg, \text{conc. } HCl} R-CH_3 + H_2O$
  • D
    $Ar-CH_3 \xrightarrow{CrO_2Cl_2, CS_2} Ar-CHO$

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