Question

$C_5{H}_{12}$ has a symmetrical structure with one quarternary 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 quarternary

carbon.Hence its structure is:

It is symmetrical

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

Primary suffix = ane

Secondary prefix = 2,2-Dimethyl

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