1.

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

Answer» 5th member of alkyne has the molecular formula `C_(6)H_(10)`. The possible isomers are:
(a) `underset("Hex-1-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) `underset("3-Methylpent-1-yne")(HC-=C-underset(CH_(3))underset(|)"CH"-CH_(2)-CH_(3))`
(e) `underset("4-Methylpent-1-yne")(HC-=C-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3))`
(f) `underset("4-Methlpent-2-yne")(CH_(3)-C-=C-underset(CH_(3))underset(|)(CH)-CH_(3))`
(g) `underset("3,3-Dimethylbut-1-yne")(HC=C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3))`


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