Question

An isomer of ethanol is :

• A. methanol
• B. diethyl ether
• C. acetone
• D. dimethyl ether

Answer 1

The correct option is D dimethyl ether

Dimethyl ether $\left(C{H}_{3}OC{H}_3\right)$ is a functional group isomer of ethanol $\left(C{H}_{3}C{H}_{2}OH\right).$
Isomers which show a difference in the functional group present in the carbon chain is known as functional isomerism. Hence, the correct answer is option (d).