A) 1 -methyl-3 ethyl cyclohexane
B) 1 -ethyl-3 methyl benzene
C) 1 -ethyl-3 methyl cycio hexane
D) Cycio hexane-1 -ethyl-3-methyl
Correct Answer: D
Solution :Ethyl group comes first in alphab- atical order but IUPAC name of 2-bromo-4-ethyl-l-methyl cyclohexane. It follows lowest sum rule (i.e., lowest set of locant is preferred.) Lowest sum of locant is\[~=1+2+3=6\]
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