Question

The IUPAC name of \[{\left( {{\rm{C}}{{\rm{H}}_{\rm{3}}}} \right)_{\rm{2}}}{\rm{CHC}}{{\rm{H}}_{\rm{2}}}{\rm{Br}}\] is:
A.\[{\rm{1 - bromo - 2 - methylpropane}}\]
B.\[{\rm{2 - bromo - 2 - methylpropane}}\]
C.\[{\rm{1 - bromo - 1 - methyl}}\;{\rm{propane}}\]
D.\[{\rm{2 - bromo - 1 - methyl}}\;{\rm{propane}}\]

Answer 1

Hint: The IUPAC nomenclature is a method of naming the organic compounds based on the compound's structural formula. The carbon in which halogen is attached is taken as the parent carbon atom and numbered that carbon.

Step by step answer:
As we all know, the name of an organic compound is derived by first identifying parent hydrocarbons, functional groups, and then finally checking substituents. Hydrocarbon is saturated hydrocarbon if it contains only a single finally bond. The IUPAC name of saturated hydrocarbons is alkanes.

The names of such compounds depend on their structure of a chain and end with a suffix "-ane" and prefix indicating the number of carbon atoms. To identify the IUPAC name of the given compound, first of all, we have to draw the check the number of carbon and substituent positions.

The IUPAC name of \[{\left( {{\rm{C}}{{\rm{H}}_{\rm{3}}}} \right)_{\rm{2}}}{\rm{CHC}}{{\rm{H}}_{\rm{2}}}{\rm{Br}}\] is \[{\rm{1 - bromo - 2 - methylpropane}}\].
The structure of this compound is shown below.

Since the longest carbon chain consists of three carbon atoms, so the parent name will be propane. Also, there is one bromine substituent on the first carbon and the methyl substituent on the second carbon atom. So, the IUPAC name will be 1-Bromo-2-methylpropane.
Hence, the correct option for this question is A that is \[{\rm{1 - bromo - 2 - methylpropane}}\].


Note: Thus, the IUPAC name is based on certain rules that lay the foundation of the hydrocarbons or organic compounds' nomenclature. Before the IUPAC system of nomenclature, the organic compounds were named based on origins.