The first step to name the given alkane is to identify its longest carbon chain, which will be the main chain of the organic molecule:
This chain contains 7 carbons, which means that the compound is a heptane.
Now, we have to identify the branches of the chain:
This chain has 2 carbons, which is named as ethyl, and it is located at the third carbon of the chain, therefore, the full name of this compound is:
3-ethyl-heptane
