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Which type of isomerism is shown by But-2-yne and cyclobutene?

1. Ring chain isomerism
2. Chain isomerism
3. Position isomerism
4. Functional isomerism

Correct answer: Ring chain isomerism

Solution

But-2-yne and cyclobutene have the same molecular formula, C4H6, but differ in whether the carbon atoms form a ring. This open-chain vs cyclic difference is ring-chain isomerism.

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