• 1. 从溴乙烷制取1，2二溴乙烷，下列制取方案中最好的是(　　)

  A . CH₃—CH₂Br CH₃CH₂OH CH₂=CH₂ CH₂BrCH₂Br B . CH₃—CH₂Br CH₂Br—CH₂Br C . CH₃—CH₂Br CH₂=CH₂ CH₂BrCH₃ CH₂Br—CH₂Br D . CH₃—CH₂Br CH₂=CH₂ CH₂Br—CH₂Br