单项选择题
A.C2H5Cl(Br)C2H5 B.ClCH2(CH2)2CH2Cl C.CH3CH2CH(OH)CH2CH3 D.CH3CH(Br)CH2CH3
A.(CH3)2C===CHCH3 B.(CH3)2C===CH2 C.(CH3)2C===C(CH3)2 D.CH3CH===CH2
A.③>①>④>② B.②>③>①>④ C.①>②>④>③ D.①>②>③>④