Question

Which of the following is a functional isomer of pentan-2-ol?

Options

• Pentan-2-one

• Pentan-3-ol

• Pentan-1-ol

• Ethoxypropane

Answer 1

Ethoxypropane

Explanation:

\[\begin{array}{cc}
\ce{CH3 - CH - CH2 - CH2 - CH3}\\
|\phantom{................}\\
\ce{\underset{Pentan-2-ol}{OH}}\phantom{..............}
\end{array}\]

\[\ce{\underset{Ethoxypropane}{CH3 - CH2 - O - CH2 - CH2 - CH3}}\]

Pentan-2-ol and ethoxypropane have same molecular formula (C₅H₁₁O) but former has alcoholic (−OH) functional group and the latter has ether (−O−) functional group.