Question

A functional isomer of ethanol is

• A. Methanol
• B. Diethyl ether
• C. Ethanal
• D. Dimethyl ether

Answer 1

The correct option is D

Dimethyl ether

Functional isomers are the ones with the same molecular formula but the different functional group. The molecular formula for dimethyl ether is ${\text{C}}_2{\text{H}}_6\text{O}$ similar to ethanol. Dimethyl ether has structural formula ${\text{CH}}_3{\text{OCH}}_3$ and ethanol has structural formula ${\text{CH}}_3{\text{CH}}_2\text{OH}$. Therefore, dimethyl ether is the functional isomer of ethanol as both have the same molecular formula but one is an ether and the other is an alcohol.