Q11 · CSIR NET Chemistry, December 2019
Paper: CSIR NET December 2019 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Nomenclature Polycyclics · Marks: 2 · Difficulty: Medium
The correct IUPAC name for the following molecule is 
(a)1-propyl-2-ethyl-,4,4-dimethylcyclohept-1-ene
(b)2-ethyl-4,4-dimethyl-1-propylcyclohept-1-ene
(c)3-ethyl-1,1-dimethyl-4-propylcyclohept-3-ene
(d)1,1-dimethyl-3-ethyl-4-propylcyclohept-3-ene
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The ring double bond takes locants 1,2. Substituent locants {1,2,4,4} are lowest, and the ethyl/propyl choice is settled alphabetically: 2-ethyl-4,4-dimethyl-1-propylcyclohept-1-ene (b).
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