以溴乙烷为原料制备12二溴乙烷,下列方案中最合理的是
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A.CH3CH2BrCH3CH2OH
CH2===CH2CH2BrCH2Br
B.CH3CH2BrCH2BrCH2Br
C.CH3CH2BrCH2===CH2CH3CH2Br
CH2BrCH2Br
D.CH3CH2BrCH2===CH2CH2BrCH2Br