IUPAC name of the following compound (P) is :

For IUPAC naming of substituted cyclohexanes:

- First identify all substituents on the cyclohexane ring.

- The compound has two methyl groups on the same carbon and an ethyl group on another carbon.

- Number the ring to give the lowest set of locants. The ethyl group and the two methyl groups should receive the lowest possible numbers.

- With dimethyl on one carbon and ethyl on another, numbering gives: the dimethyl carbon as position 1 and ethyl as position 3, yielding 3-Ethyl-1,1-dimethylcyclohexane.

The answer is 3-Ethyl-1,1-dimethylcyclohexane, which corresponds to Option (2).