JEE Main · 2024 · 27 Jan 2024 · Shift 1 · General Organic Chemistry

IUPAC name of following compound (P) is :

(A)l-Ethyl-5, 5-dimethylcyclohexane
(B)3-Ethyl-1,1-dimethylcyclohexane✓ Correct
(C)1-Ethyl-3, 3-dimethylcyclohexane
(D)1,1-Dimethyl-3-ethylcyclohexane

Answer: (B)

Solution

The parent ring is cyclohexane carrying two methyl groups on one carbon and an ethyl group elsewhere. Numbering to give the lowest locant set places the geminal dimethyl carbon at C1 and the ethyl group at C3; substituents are then cited alphabetically (ethyl before methyl), giving 3-Ethyl-1,1-dimethylcyclohexane.

JEE Main · 2024 · 27 Jan 2024 · Shift 1 · Single correct option

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