JEE Main Chemistry question

The IUPAC name of CH₃–C≡C–CH(C₂H₅)–CH=CH₂ is

(A)3-Ethylhex-1-en-4-yneCorrect
(B)5-Ethyl-4-methylhex-2-yn-5-ene
(C)3-Methylenehepta-5-yne
(D)5-Methylene-5-ethyl-4-methylhepta-2-yne

Answer: (A)

Solution

The longest chain carrying both multiple bonds runs CH₂=CH–CH(C₂H₅)–C≡C–CH₃ (6 carbons), with an ethyl substituent at C4 (numbering from the alkene end, which gives the lower locant

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Question ID VK-139984