Which of the following is not a substitution reaction?

  • A
    Cyclohexanol reacting with $SOCl_2$
  • B
    $1-$Nitro$-4-$ethylcyclohexane reacting with $Br_2$ in the presence of $h\nu$
  • C
    $1-$Methylcyclohexene reacting with $HI$
  • D
    $CH_2Br-CH_2Br \xrightarrow{NaI} CH_2=CH_2 + NaBr + HI$

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