MCQ
$IUPAC$ name of ${(C{H_3})_3}C - CH = C{H_2}$ is
  • A
    $3,3,3-$trimethyl$-1-$propene
  • B
    $1,1,1-$trimethyl$-2-$propene
  • $3,3-$dimethyl$-1-$butene
  • D
    $2,2-$dimethyl$-3-$butene

Answer

Correct option: C.
$3,3-$dimethyl$-1-$butene
c
The IUPAC name of $\left( CH _3\right)_3 C - CH = CH _2$ is $3,3$ -dimethyl-$1$-butene.

The parent hydrocarbon contains $4 C$ atoms and a $C = C$ double bond.

Hence, it is a butene. Two methyl groups are present as substituents on third $C$ atom. Prefix $di$ indicates two methyl groups.

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