A 1-己炔 CH3CH2CH 2CH2C≡CH
B 4-甲基-2-戊炔 (CH3)2CHC≡CCH3
C 3-己炔 CH32CH2C≡CCH2CH3
D 3-甲基-1,4-戊二烯 CH2=CHCH(CH3)CH=CH2