Question

Which type of isomerism is shown by But-1-yne and cyclobutene?

• A. Chain isomerism
• B. Position isomerism
• C. Ring-chain isomerism
• D. Metamerism

Answer 1

The correct option is C Ring-chain isomerism

The structural isomers with same molecular formula but possessing both cyclic structures and open chain structures will show Ring-Chain isomerism.

Here, But-1-yne is open chain and Cyclobutene is cyclic. Hence , they shows ring-chain isomers.
All ring chain isomers are functional isomers but all functional isomers are not ring-chain isomers