What is IUPAC name of following compound?

What is IUPAC name of following compound?

1. 1-Iodo-1,3,4-trimethylhex-2-ene
2. 2-Iodo-4,5-dimethylhept-3-ene
3. 2-Iodo-5-ethyl-4-methylhex-3-ene
4. 1-Iodo-4-ethyl-1,3-dimethylpent-2-ene

Asked in: MHT CET 2023 (13 May Shift 2)

Practice more Basic Principles of Organic Chemistry questions on Aicharya