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But-2-ene (CH3-CH=CH-CH3) and cyclobutane (a four-membered saturated carbon ring) have the same molecular formula C4H8. What type of structural isomerism do they exhibit?

1. Ring-chain Isomers
2. Chain Isomers
3. Position Isomers
4. Functional Isomers

Correct answer: Ring-chain Isomers

Solution

Both but-2-ene and cyclobutane have molecular formula C4H8. Since one is acyclic (chain) and the other is cyclic (ring), they are ring-chain isomers.

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