CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES
317701
For the given alkane,
1 1,1-dimethyl-5-ethyl octane
2 6-ethyl-2-methyl nonane
3 4-ethyl-8-methyl nonane
4 2-methyl-6-propyl octane
Explanation:

The correct name is 6-ethyl-2-methyl nonane.