Question

Give IUPAC names of the following compound:

\[\begin{array}{cc}
\phantom{..}\ce{H}\phantom{...}\ce{CH3}\phantom{.}\ce{H}\phantom{..}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{}\\
\ce{H - C - C - C - H}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{}\\
\phantom{.}\ce{H}\phantom{...}\ce{OH}\phantom{.}\ce{H}\phantom{.}\\
\end{array}\]

Options

• Dimethyethyl alcohol

• 1-Methylpropan-1-ol

• 2-Methylpropan-2-ol

• 2-Methylpropan-1-ol

Answer 1

2-Methylpropan-2-ol

Explanation:

The longest chain has three carbons and at the 2^nd position, both –OH and –CH₃ groups are attached.

\[\begin{array}{cc}
\phantom{....}\ce{^1CH3}\\
\phantom{...}|\\
\ce{CH3 - ^2C - OH}\\
\phantom{...}|\\
\phantom{....}\ce{^3CH3}
\end{array}\]

Common name: tert-Butyl alcohol

IUPAC name: 2-Methylpropan-2-ol