JEE Main Chemistry question

The IUPAC name of the compound (CH₃)₂CH–CH=CH–CH(OH)–CH₃ is

(A)5-methyl-hex-3-en-2-olCorrect
(B)2-methyl-hex-3-en-5-ol
(C)2-hydroxy-5-nethyl-3-hexene
(D)5-hydroxy-2-methyl-3-hexene

Answer: (A)

Solution

The longest chain containing the –OH (principal characteristic group) is 6 carbons: CH₃–CH(CH₃)–CH=CH–CH(OH)–CH₃. Numbering must give the lowest locant to –OH (suffix) first: numbering from the CH(OH) end gives OH at C2, the double bond at C3–C4, and a methyl substituent at C5 —

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Question ID VK-138954