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Question

Which of the following pairs of compounds represent functional group isomerism?

A
Diethyl ether and Ethanol
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B
Dimethyl ether and Ethanol
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C
Acetaldehyde and Propanal
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D
Isobutane and Butane
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Solution

The correct option is B Dimethyl ether and Ethanol
Functional isomers have the same molecular formula but different functional groups.
Compounds in options a) and c) are not even isomers as the pairs have different molecular formulas while in option d), compounds are chain isomers as they have different number of carbons in their parent chains and belong to the same homologous series.

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