In the reaction,the hybridisation states of carbon atoms $1, 2, 3, 4$ are:
$Br-CH=CH-Br \xrightarrow[Catalyst]{H_2} Br-CH_2-CH_2-Br$

  • A
    $1$ and $2$ are $sp^2$; $3$ and $4$ are $sp^3$
  • B
    $1$ and $2$ are $sp^2$; $3$ and $4$ are $sp$
  • C
    $1, 2, 3$ and $4$ are $sp$
  • D
    $1, 2$ are $sp^3$; $3, 4$ are $sp^2$

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