JEE Main 2015 Chemistry question

Which of the following pairs of compounds are positional isomers?

(1) and Correct
(2) and
(3) and
(4) and

Answer: (1)

Solution

Positional isomers have the *same molecular formula, the same carbon skeleton and the same functional group*, differing only in where that group sits on the skeleton. In option (1) both compounds are straight-chain ketones — pentan-2-one and pentan-3-one — differing only in whether

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Question ID VK-115356