Question

The IUPAC name of the compound having the formula is

• A. 3,3,3-Trimethyl-1-propene
• B. 1,1,1-Trimethyl-2-propene
• C. 3,3-Dimethyl-1-butene
• D. 2,2-Dimethyl-3-butene

Answer 1

The correct option is C 3,3-Dimethyl-1-butene

The functional group in given compound is alkene so numbering must be done where double bond gets lowest locant.
Suffix used for alkene is ene.
Two methyl group is present at 3rd carbon as a substituent. The parent chain is of four carbon so the word root will be but. Thus, the correct IUPAC name is 3-dimethyl-1-butene.