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Identify correct statement from the following: A. Propanal and propanone are functional isomers. B. Ethoxyethane and methoxypropane are metamers. C. But-2-ene shows optical isomerism. D. But-1-ene and but-2-ene are functional isomers. E. Pentane and 2,2-dimethyl propane are chain isomers. Choose the correct answer from the options given below:

1. B, C and D only
2. A, B and C only
3. A, B and E only
4. C, D and E only

Correct answer: A, B and E only

Solution

Propanal and propanone are functional isomers because they have different functional groups (aldehyde vs ketone), ethoxyethane and methoxypropane are metamers as they have the same molecular formula but different alkyl groups on either side of the ether bond, and pentane and 2,2-dimethylpropane are chain isomers due to different carbon chain arrangements.

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