F1,F2是：CHBr=CBr(CH3)-C(CH3)=CH2或者CHBr-C(CH3)＝C(CH3)-CH2Br
因为F1可生成G2、G2所以F1是CHBr=CBr(CH3)-C(CH3)=CH2
F2是CHBr-C(CH3)＝C(CH3)-CH2Br
所以G1是.CH2BrCH(CH3)CBr(CH3)CH2Br
E是CH2=C(CH3)-C(CH3)=CH2