IUPAC name of $({ { CH }_{ 3 }) }_{ 2 }CHCH({ { CH }_{ 3 }) }_{ 2 }$ is?
A. 2,2-dimethylbutane
B. 2,3-dimethylbutane
C. 2,4-dimethylbutane
D. 1-methylpentane

Hint: It is an isomer of hexane and it is a colorless liquid which boils at ${ 57.9 }^{ \circ }$C. Now, try to recall and figure out what is the IUPAC name.

Complete step by step answer:
In order to give compounds a name, particular rules must be followed. When naming organic compounds the IUPAC nomenclature is used.

The rules which must be followed are:
Step-1: First you need to identify the functional group.
Step-2: We need to find the longest carbon chain.
Step3: We need to number the longest carbon chain accordingly.
Step-4: Now look for any branched group, name them accordingly and give them and give their position on the carbon chain.
Step-5: Now combine the elements into a single word.

Hence, the IUPAC name of (${ { CH }_{ 3 }) }_{ 2 }CHCH({ { CH }_{ 3 }) }_{ 2 }$ is 2,3-dimethylbutane. Therefore, option B is the required answer.

Note: 2,3-dimethylbutane is used in high-octane fuel and to make other organic chemicals, it is also used as a solvent. It occurs in gasoline, rubber solvent and petroleum ether. 2,3-dimethylbutane is an alkane that is butane substituted by a methyl group at positions 2 and 3.