IUPAC name of is
2-Methyl-2, 3-diethyl pentane
4-Ethyl-3, 3-dimethyl hexane
3,4-diethyl-4-methyl pentane
3-Ethyl-4, 4-dimethyl hexane
→ Select longest continuous carbon chain as parent chain.
→ Sum of the substituent located carbons should get lowest number[Lowest number rule]