Write the structures of different isomers corresponding to the `5^(th)` member of alkyne series. Write their IUPAC names.

Explanation

`5^(th)` Member of alkyne series is `C_(6)H_(10)` since first member is `C_(2)H_(2)`. The possible isomers and their IUPAC names are :
i) `HC-=C-CH_(2)-CH_(2)-CH_(2)-CH_(3)` Hex-1-yne
ii) `CH_(3)-C-=C-CH_(2)-CH_(2)-CH_(3)` Hex-2-yne
iii) `CH_(3)-CH_(2)-C-=C-CH_(2)-CH_(3)` Hex-3-yne
iv) `HC-=C-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)` 3-Methylpent-1-yne
v) `HC-=C-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3)` 4-Methylpent-2-yne
vi) `CH_(3)-C-=C-underset(CH_(3))underset(|)(CH)-CH_(3)` 4-Methylpent-3-yne
vii) `HC-=C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)` 3,3-Dimethylbut-1-yne