单项选择题
A.(CH3)2CHCl B.CH3CH2CH2Cl C.(CH3)3CCl D.CH3Cl
A.④>③>①>② B.②>①>③>④ C.④>③>②>① D.③>④>②>①
A.④>②>③>① B.②>①>③>④ C.④>②>①>③ D.②>④>③>①