3、写出下列化合物的构造式（键线式）。 (1)2,3-dimethyl-1-pentene (2)cis-3,5-dimethyl-2-heptene
(3)(E)-4-ethyl-3-methyl-2-hexane (4)3,3,4-trichloro-1-pentene Cl Cl Cl
CH CH H CH--CH. CH2-C- CH-CH2- CH2-CH CHCH
4、 写出下列化合物的构造式。 ⑴ (E)-3,4-二甲基-2-戊烯 (2) 2,3-二甲基-1-己烯 C=C CH3 H CH—CH3 CH3 CH3 CH2 =C - CH - CH2 - CH2 - CH3 CH3 CH3
(CH3) H H CH H CH2-Ch2- ch CHCH CH- CH
⑶ 反-4,4-二甲基-2-戊烯 (4) (Z)-3-甲基-4-异丙基-3-庚烯 C=C （CH3）3 C CH H 3 H C=C CH2 - CH2 - CH3 CH3 CH2 H CH - CH3 CH3
CH CHo CH CHo-C-CH=C-CH-CH- CH CH CH
⑸ 2,2,4,6-四甲基-5-乙基-3-庚烯 CH3 - C - CH=C - CH - CH – CH3 CH3 CH3 CH3 CH3 CH2 CH3