选C
A:正丁烷 CH3CH2CH2CH3 一氯代产物2种
B.异丁烷CH3-CH(CH3)-CH3 一氯代产物2种
C.CH3-CH(CH3)-CH2-CH3 一氯代产物4种
D.CH3C(CH3)2 一氯代产物1种