Which pair of compounds are functional group isomers?
Correct answer: C. Propanal and propanone
- A. Propan-1-ol and propan-2-ol
- B. Butane and 2-methylpropane
- C. Propanal and propanone
- D. Ethane and propane
Explanation
Propanal is an aldehyde and propanone a ketone, yet both have the molecular formula C3H6O, so they differ in functional group. The two propanols differ only in the position of the same hydroxyl group, making them position isomers, and butane with 2-methylpropane are chain isomers. Ethane and propane are homologues, not isomers, since their formulae differ.
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About Isomerism
Isomerism occurs when compounds have the same molecular formula but different atom arrangements or spatial orientations. The content includes chain, position, functional, metameric and tautomeric isomerism, along with geometrical and optical isomerism, including cis-trans forms, E/Z notation, chirality and enantiomers.
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