Question

Consider the following statements:
(A) Propanal and Propanone are functional isomers.
(B) Ethoxyethane and methoxypropane are metameres.
(C) But-2-ene shows optical isomerism.
(D) But-1-ene and But-2-ene are functional isomers.
(E) Pentane and 2, 2-dimethylpropane are chain isomers.
In the light of the above statements, choose the correct option.

• A. A, B, D only
• B. B, C, D only
• C. A, B, E only
• D. A, B, D, E only

Hint:

For isomerism, functional isomers differ in functional groups, metameres have different alkyl groups attached to the same functional group, and chain isomers differ in the carbon chain arrangement.

Answer 1

The Correct Option is C

Step 1: Analyzing the statements.
- (A) Propanal and Propanone are functional isomers since they differ in functional groups (aldehyde and ketone).
- (B) Ethoxyethane and methoxypropane are metameres because they are ethers with different alkyl groups on either side of the oxygen atom.
- (C) But-2-ene doesn’t show optical isomerism as it contains a plane of symmetry and no chiral center.
- (D) But-1-ene and But-2-ene are position isomers, not functional isomers.
- (E) Pentane and 2, 2-dimethylpropane are chain isomers since they differ in the carbon chain arrangement.
Step 2: Conclusion.
The correct answer is (3) as statements A, B, and E are true.