Which one of the following is a free-radical substitution reaction?

  • A
    $CH_3CHO + HCN \to CH_3CH(OH)CN$
  • B
    $CH_4 + Cl_2 \xrightarrow{h\nu} CH_3Cl + HCl$
  • C
    $CH_2=CH_2 + H_2O \xrightarrow{H^{+}} CH_3CH_2OH$
  • D
    $CH_3CHO + NH_2NH_2 \to CH_3CH=NNH_2 + H_2O$

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