The IUPAC name of the following compound is
4-methyl-3-ethyl hex-4-ene
4,4-diethyl-3-methylbut-2-ene
3-ethyl-4methylhex-4-ene
4-ethyl-3-methylhex-2-ene
Step(1): Choose the longest chain including alkene
Step(2) Choose the side-chain alphabetically.
So, The name of the compound is 4-ethyl-3-methylhex-2-ene.
Therefore, option(4) is correct.