Question

$C_5{H}_{12}$ has a symmetrical structure with one quaternary carbon. Its IUPAC name is:

• A. 2-Methylbutane
• B. n-Pentane
• C. 2,2-Dimethylpropane
• D. 1-Methylbutane

Answer 1

The correct option is C

2,2-Dimethylpropane

$C_5{H}_{12}$ is of the form $Cn{H}_{2n+2}$.

Hence it is a saturated alkane. Further, it is given that it has a quaternary carbon. Hence its structure is:

Longest chain = 3 carbons $\Rightarrow$ word root = prop

Primary suffix = ane

Secondary prefix = 2,2-Dimethyl

IUPAC name is (c) 2,2-Dimethyl propane