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 for mula `C _(6) H _(10).` The posible isomers are :
`(a)underset("Hex-l-yne") (HC= C-CH _(2)) - CH _(2) - CH _(2) - CH _(3)`
(b) `underset("Hex-2-yne") (CH _3) = C-=C - CH _(2) - CH _(2) - CH _(3)`
(c) `underset("Hex-3-yne") (CH _(3) - CH _(2) -) C -=C = -CH _(2) - CH _(3)`
(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.