Which of the structures shown is a structural isomer of the compound shown?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: B

The compound shown is diethyl ether, C4H10O. Only Structure B (butan-1-ol, C4H10O) has the same molecular formula; it is a functional isomer. Propan-1-ol is C3H8O, propanone is C3H6O and methyl propanoate is C4H8O2.

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