Question

The compound which is not isomeric with diethyl ether is :

• A. n-propyl methyl ether
• B. butan-1-ol
• C. 2-methylpropan-2-ol
• D. butanone

Answer 1

The correct option is D butanone

Alcohols and ethers are example of functional isomerism because isomers which show a difference in the functional group present in the carbon chain is known as functional isomerism.
Structures of all the given compound are

The first three are isomers of diethyl ether, $C_2{H}_{5}O{C}_2{H}_5\left(C_4{H}_{10}O\right)$

Butanone$\left(C_4{H}_{8}O\right)$ doesnot have same molecular formula as diethylether$\left(C_4{H}_{10}O\right)$