A.2-乙基-1,3-丁二烯的结构简式为
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/63d0f703918fa0ecde8a07bb259759ee3d6ddb33?x-bce-process=image/quality,q_85)
,键线式中用短线“-”表示化学键,端点、交点表示碳原子,C原子、H原子不需要标出,所以2-乙基-1,3-丁二烯的键线式为:
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/503d269759ee3d6d8e8be47d40166d224f4ade33?x-bce-process=image/quality,q_85)
,故A正确;
B.铁原子失去最外层4s能级2个电子形成Fe
2+,其核外电子排布式为1s
22s
22p
63s
23p
63d
6,故B错误;
C.P的最外层3p电子应自旋方向相同,应为
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/730e0cf3d7ca7bcbe336a499bd096b63f624a833?x-bce-process=image/quality,q_85)
,故C错误;
D.己炔碳链含有6个C,3、4号C含有碳碳三键,该有机物的结构简式为:CH
3CH
2C≡CCH
2CH
3,故D错误;
故选A.