Question

The compound(s) which is/are isomeric with diethyl ether include(s) :

• A. Butan-1-one
• B. Butan-1-ol
• C. 2-methylpropan-2-ol
• D. n-propyl methyl ether

Answer 1

Answer: (B), (C), (D)

The correct options are
B Butan-1-ol
C 2-methylpropan-2-ol
D n-propyl methyl ether


Molecular formula of diethyl ether is: $C_4{H}_{10}O$
(b) and (c) have same molecular formula of $C_4{H}_{10}O$ but the functional group present is alcohol in both. Functional isomers shows a difference in the functional group present in the carbon chain. So, (b) and (c) are functional isomers of diethyl ether.

Structural isomers in which there is a difference in the relative position of alkyl group around polyvalent atom/functional groups are called metamers. In (d) there is a change in position of $-O-$ functional group.
So diethyl ether and n-propyl methyl ether are metamers.
(a) has different molecular formula $\left(C_4{H}_{8}O\right)$ as compared to diethyl ether $\left(C_4{H}_{10}O\right)$ and hence it is not an isomer

Structures of all the given compound are :