Write structures of different isomers corresponding to the `5^(th)` member of alkyne series. Also write IUPAC names of all the isomers. What type of isomerism is exhibited by different pairs of isomers?

Explanation

`5^(th)` member of alkyne has the molecular formula `C_6H_10`. The possible isomers are:
(a)`CH-=C-CH_2-CH_2-CH_2-CH_3` Hex-1-yne
(b)`CH_3-C-=C-CH_2-CH_2-CH_3` Hex-2-yne
(c) `CH_3-CH_2-C-=C-CH_2-CH_3` Hex-3-yne
(d) `HC-=C-underset(CH_3)underset|CH-CH_2-CH_3` 3-Methylpent-1-yne
(e)`HC-=C-CH_2-underset(CH_3)underset|CH-CH_3` 4-Methylpent-1-yne
(f)`CH_3-C-=C-underset(CH_3)underset|CH-CH_3` 4-Methylpent-2-yne (g)`HC-=C-underset(CH_3)underset|overset(CH_3)overset|C-CH_3` 3,3-Dimethylbut-1-yne
Position and chain isomerism shown by different pairs.