16.下列Br2與CH3CH=CHCH3反應何者正確? (A)CH3CH=CHCH3+Br2→CH3CHBrCH2CH3+HBr (B)CH3CH=CHCH3+Br2→BrCH2CHCHBrCH3 (C)CH3CH=CHCH3+Br2→BrCH2CH2CH2CH2Br (D)CH3CH=CHCH3+Br2→CH3CHBrCHBrCH3