What is the IUPAC name of CH2=C(CH3)CH(CH3)CH3?

Answer 1

I am not an organic chemist; therefore, I am likely to lead you astray on naming by the IUPAC system. I refer you to
h ttps://chem.libretexts.org/Bookshelves/Organic_Chemistry/Supplemental_Modules_(Organic_Chemistry)/Alkenes/Naming_the_Alkenes