Which of the structures shown is a ring-chain isomer of the compound shown?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: B

The compound shown is but-2-ene (C4H8). Ring-chain isomers have the same formula but one is cyclic and the other open-chain: Structure B (cyclobutane) fits. A (but-1-ene) is a position isomer, C (2-methylpropene) is a chain isomer, and D (butane) is C4H10, not an isomer.

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