JEE Main Chemistry question

Give the IUPAC name of 5-methyl-3-ethylcyclohex-1-ene (a cyclohexene ring bearing a methyl and an ethyl substituent at the positions shown).

(A)1,1,3-trimethylcyclohex-2-ene
(B)1,3,3-trimethylcyclohex-1-ene
(C)1,1,5-trimethylcyclohex-5-ene
(D)2,6,6-trimethylcyclohex-1-eneCorrect

Answer: (D)

Solution

For a cyclohexene ring, the double bond is fixed between C1–C2 (lowest locants to the principal characteristic feature, here the ring unsaturation), then substituents are numbered to give the lowest locant set. A

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Question ID VK-138974