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  4. Which of the following is NOT a pair of functional isomers?

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Q. Which of the following is NOT a pair of functional isomers?

KCETKCET 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

Functional isomers are compounds having the same molecular formula but different functional groups. Both the compounds given in option c are ethers. $C _{2} H _{5} OC _{2} H _{5}$ and $C _{3} H _{7} OCH _{3}$ are metamers, while the rest of the options are examples of functional isomers.