单项选择题
A.四种 B.五种 C.六种 D.七种
A.CH3CH=CHCH3与CH2=CHCH2CH3 B.CH3CH2CH2OH与CH3CH2OCH3 C.CH3COCH2CH2OCH3与CH3CH2COOCH2CH3 D.CH2=CHOH与CH3CHO
A.环戊烷 B.环戊烯 C.1,3-环戊二烯 D.1,4-环己二烯