Which of the following reactions represents Clemmensen reduction?

  • A
    $R-CO-Cl \xrightarrow{H_2, Pd-BaSO_4} R-CHO + HCl$
  • B
    $R-CN \xrightarrow[H_3O^+]{SnCl_2, HCl} R-CHO + NH_4Cl$
  • C
    $R-CHO \xrightarrow[\Delta]{Zn-Hg, \text{Conc. } HCl} R-CH_3 + H_2O$
  • D
    $R-CO-R \xrightarrow[(ii) KOH, \Delta]{(i) H_2N-NH_2, HO-(CH_2)_2-OH} R-CH_2-R$

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