# The IUPAC name of the compounds having the formula

(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

The correct name is 3,3 - Dimethyl - 1 - butene.
Hence c is the correct answer.