Write the `IUPAC` name of

Explanation

1.The longest chain containing functional group is of `7` carbon atoms.Therefore, the word root is hept & the chain is numbered as shown.
2.There is no multiple bond in it.Hence, the primary suffix is `an e`.
3.The functional groups is `-CN`.Hence, secondary suffix is `nitril e`
4.Moreover, there is a methyl group on carbon `5` and ethyl group on carbon `3`.
5.The `IUPAC` name is, therefore,`3`-Ethyl-`5`-methylheptanenitrile