2-甲基-1.3丁二烯和溴化氢1:1加成方程式

CH2=C(CH3)CH=CH2+HBr →BrCH2-CH(CH3)-CH=CH2CH2=C(CH3)CH=CH2+HBr →CH2=CH(CH3)-CHBrCH3CH2=C(CH3)CH=CH2+HBr →BrCH2-C(CH3)=CHCH3CH2=C(CH3)CH=CH2+HBr →CH3-C(CH3)=CHCH2Br就这四种反应.