MHT CET 2023 Chemistry question

What is IUPAC name of crotonyl alcohol?

(A)But-3-en-1-ol
(B)But-2-en-1-olCorrect
(C)But-1-en-2-ol
(D)But-1-en-3-ol

Answer: (B)

Solution

Crotonyl alcohol is the alcohol related to crotonic acid (but-2-enoic acid), i.e. \mathrm{CH_3{-}CH{=}CH{-}CH_2{-}OH}. Number the chain from the end nearer the -OH group (the principal functional group gets the lowest locant): , so -OH is at C-1 and

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Question ID VK-098035