Identify the pairs of compounds which are funtional group isomers.
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Two or more compounds having the same molecular formula but different functional groups are called functional isomers.
In the given structure I, II, III, IV represent alcohols as functional group, whereas V, VI, VII are eithers.
Hence, I and V, I and VI, I and VII, II and V, II and V, II and VI, II and VII, III and V, III and VI, III and VII, IV and V, IV and VI, IV and VII all are functional group isomers.
