The IUPAC name of the following compound is :
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- 1, 1-Dimethyl-2-ethylcyclohexane
- 2-Ethyl-1,1-dimethylcyclohexane
- 1-Ethyl-2,2-dimethylcyclohexane
- 2, 2-Dimethyl-1-ethylcyclohexane
The Correct Option is B
Solution and Explanation
Substituents: two CH3 and one C2H5.
Numbering option A: gem-dimethyl carbon = C1, ethyl carbon = C2 gives locant set {1,1,2}.
Numbering option B: ethyl carbon = C1, gem-dimethyl carbon = C2 gives locant set {1,2,2}.
The lowest locant set at the first point of difference is {1,1,2}, so option A is used.
Alphabetical order: ethyl comes before dimethyl (methyl), so the name is 2-ethyl-1,1-dimethylcyclohexane.
Answer: (2) 2-Ethyl-1,1-dimethylcyclohexane
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