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Question: which of the following compounds with molecular formula \( {C_4}{H_8}O \) Will not show functiona...

which of the following compounds with molecular formula C4H8O{C_4}{H_8}O
Will not show functional isomers
(A)\left( A \right) aldehyde and ketone
(B)\left( B \right) alkene and ketone
(C)\left( C \right) aldehyde and alkene
(D)\left( D \right) epoxides and esters

Explanation

Solution

Hint : Isomers are the molecules which have the same molecular formula but different arrangements of atoms in the space . Even though they have the same molecular formula they don’t have the same physical and chemical properties .

Complete step by step answer
Functional isomers are those isomers which have the same molecular formula but different functional groups .
Going through the options
(A)\left( A \right) Aldehyde and ketone : In the question we have given C4H8O{C_4}{H_8}O . Butanal is the possible structure from this molecular formula CH3CH2CH2CHOC{H_3}C{H_2}C{H_2}CHO this is an aldehyde .
2-Butanone which is a ketone can also be formed CH3COCH2CH3C{H_3}COC{H_2}C{H_3}
So , these two show functional isomers .
(B)\left( B \right) Alkenol or alcohol the possible structure is cyclobutanol . ketone will be 2 butanone so these two will also show functional isomerism .
(C)\left( C \right) Similarly if we take aldehyde and alkene then they will also show functional isomerism .
(D)\left( D \right) Now if we take epoxides to form a cyclic ring with three atoms . which is like an equilateral triangle , it is highly reactive.
Now in case of esters , it has two oxygen in its structure and the molecular formula given contains one oxygen atom , it is obtained by the reaction of carboxylic acid and alcohol .
so clearly epoxides and esters are not functional isomers .
Option (D)\left( D \right) will be the answer.

Note
The molecular formula have lots of functional isomers some are cis-2,3 epoxy butane , trans-2,3epoxybutane , methoxy cyclopropane , allyl methyl ether , crotyl alcohol etc. there are many other isomers like position isomers , chain isomers ,skeletal isomers etc.