Question

The IUPAC name of ${\left( {CH} \right)_3}CHC{H_3}$ is
A. 2-methylpropane.
B. 2, 2-dimethylethane.
C. trimethyl methane.
D. none of these.

Answer 1

Hint: To solve this question, one should know the IUPAC system of nomenclature. The key point to solve this question is that, when the chain length is ${C_3}$, the word root will be prop-.

Complete step by step answer:
An organic compound is identified by its name and till now, several systems for nomenclature of organic compounds have been proposed. Out of these, the most advanced and systematic is called the IUPAC system, which has been proposed by IUPAC (International Union of Pune and Applied Chemistry).
Given compound is, ${\left( {CH} \right)_3}CHC{H_3}$
First, we have to draw its structure and identify the functional group attached to the parent hydrocarbon.
The structure of ${\left( {CH} \right)_3}CHC{H_3}$ will be,
                        

From the above structure, we can clearly see that a methyl group is attached to the second carbon and the length of carbon chain is 3, i.e. ${C_3}$
Therefore, the parent hydrocarbon is propane.
Hence, the IUPAC name of ${\left( {CH} \right)_3}CHC{H_3}$ is 2-methyl propane.
So, the correct answer is “Option A”.

Note: To write the name of an organic compound in accordance with IUPAC system, firstly we have to identify the parent hydrocarbon and the functional group attached to it. After that the name of parent hydrocarbon is modified by using suitable prefixes and suffixes to get the actual name of the compound.