CH3 (4) <>CH3 (6) 3、略 4、(1)、)2)、(3)无(4)顺、反两种(5)环上顺反两种,双键处顺反两种,共四种 (6)全顺、反-1、反-2、反-4共四种 CH CH(CH 3)2 CH(CH 3)2 CH(CH 3)2 C?Hg H )(CH3)3C 6(c1、/H CH3 2/N (1) P2 -CH3 CHBrCH 2 CH2 Br H3CH(O H。/Ni CH3 Zn/Ho CH3 CO(CH 2)4CHO H3C CH=CHCN 2Br Br (3) CH,=CHCOOC COOC 2H- 5 - CH3 CH3 CH3 CH3 CH3 (1) (2) (3) (4) (5) (6) (7) 2、 3、略 4、（1）、）2）、（3）无 （4）顺、反两种 （5）环上顺反两种，双键处顺反两种，共四种 （6）全顺、反-1、反-2、反-4 共四种 5、 (1) (2) (3) (4) (5) H CH(CH 3 )2 CH3 H CH(CH 3 )2 H H CH3 CH(CH 3 )2 H CH3 H H CH3 H (CH3 )3C C2H5 H (CH3 )3C H 6、 (1) CH3 CH3CH2CH2CH3 CH3CHBrCH 2CH2Br CH3CH(I)CH 2CH3 H2 /Ni Br2 HI (2) H2 /Ni Br2 CH3 CH3 Br CH3 Br O H3C O O H3C Br O3 HBr Zn/H2O CH3CO(CH 2 )4CHO (3) CN COOC2H5 Br Br Br Br CH2=CHCN 2Br2 CH2=CHCOOC 2H5