What type of isomerism is exhibited by 2-butyne and 1,3-butadiene?

Metamerism

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Functional isomerism

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Position isomerism

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Tautomers

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Solution

The correct option is B Functional isomerism
$C H_{3} - C \equiv C - C H_{3}$ is 2-butyne and $C H_{2} = C H - C H = C H_{2}$ is 1,3-butadiene.

As their molecular formula is the same but functional group is different they are functional isomers.

2-butyne has a triple bond while 1,3-butadiene has two double bonds.

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