Question

IUPAC name of the following compound is

• A. 1, 3-Dimethyl-3-ethylcycloheptane
• B. 3-Ethyl-1,3-methylcycloheptane
• C. 1-ethyl-1,3-dimethylcycloheptane
• D. None of these

Answer 1

The correct option is C

1-ethyl-1,3-dimethylcycloheptane

Here parent chain has cyclic carbons. First, identify the parent chain. Then we'll assign numbers based on lowest locant rule. The carbon with 2 substituents, in this case, gets the lower number.

Parent chain

7 carbons $\Rightarrow$ Hept [word root]

Single bond $\Rightarrow$ ane [suffix]

Cyclic$\Rightarrow$ cyclic [prefix]

Now, substitutents at $C_{1}and{C}_3$

1- Ethyl-1,3-dimethyl [alphabetically]

Therefore,

1-Ethyl-1,3-dimethylcycloheptane