Ethers are isomeric with
Alcohols
Isomers :
The explanation for the correct option
(D) - Alcohols
Functional isomers:
Explanation of incorrect options
(A) - Aldehydes
Aldehydes are members of a class of organic chemical compounds represented by the general structural formula .may be hydrogen or a hydrocarbon radical-substituted or unsubstituted.
Example-
(B) - Ketones.
In ketones, the carbonyl group has 2 hydrocarbon groups attached to it.
These can be either the ones containing benzene rings or alkyl groups. Ketones do not have a hydrogen atom attached to the carbonyl group.
Example-
Hence option (D) is the correct answer.