MHT CET 2022 Chemistry question

Which of the following pairs of compounds is an example of position isomerism?

(A)2 methylprop-1-ene and But-1-ene
(B)But-2-ene and Cis-but-2-ene
(C)But-2-ene and 2-methylprop-1-ene
(D)But-1-ene and But-2-eneCorrect

Answer: (D)

Solution

Position isomers have the same carbon skeleton and the same functional group, but the functional group (here the double bond) is at different positions. But-1-ene (CH_2=CH-CH_2CH_3) and but-2-ene (CH_3-CH=CH-CH_3) have the same four-carbon chain with the double bond

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Question ID VK-093703