JEE Main Chemistry question

H₃C–C(Cl)=CH–CH(CH₃)–CH₃ — the IUPAC name is

(A)2-chloro-4-methyl-2-penteneCorrect
(B)4-chloro-2-methyl-3-pentene
(C)4-methyl-2-chloro-2-pentene
(D)2-chloro-4,4-dimethyl-2-butene

Answer: (A)

Solution

Numbering the 5-carbon pentene chain to give the lowest locant to the principal feature (the double bond, at C2–C3) places chlorine at C2 and the methyl branch at C4:

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Question ID VK-138975