Which of the structures shown are isomers (same molecular formula) of the compound shown?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: A, B, D

The compound shown is butanone, C4H8O. Butanal (A), but-3-en-1-ol (B) and tetrahydrofuran (D) are all C4H8O; 2-methylpropanoic acid (C) is C4H8O2 and is not an isomer.

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