(1)2,6-二甲基-4-乙基辛烷中最长的主链含有8个C原子,甲基处于2、6号碳原子上,乙基处于4号碳原子上,其结构简式为CH
3CH(CH
3)CH
2CH(CH
2CH
3)CH
2CH(CH
3)CH
2CH
3,
故答案为:CH
3CH(CH
3)CH
2CH(CH
2CH
3)CH
2CH(CH
3)CH
2CH
3;
(2)依据系统命名方法,结合名称写出结构简式,2-甲基-1-戊烯的主碳链含有5个碳原子,2位上有甲基,其结构简式是:CH
2=C(CH
3)CH
2CH
2CH
3,故答案为:CH
2=C(CH
3)CH
2CH
2CH
3;
(3)
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/562c11dfa9ec8a1320988651f403918fa1ecc085?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
主碳链含有5个碳原子,4号位上有甲基,命名为:4-甲基-1-戊烯,故答案为:4-甲基-1-戊烯;
(4)
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/a8ec8a13632762d0b2bc750ea3ec08fa503dc685?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
主碳链含有5个碳原子,2,3号位上各有一个甲基,命名为:2,3-二甲基戊烷,故答案为:2,3-二甲基戊烷.