Question

The IUPAC name of ${\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{H}}_{\text{2}}}$ is:
A.methylamine
B.amino ethane
C.methanamine
D.ethylamine

Answer 1

According to IUPAC nomenclature-
-Alkanes are named using the -ane suffix to their name.
-Depending on the number of carbon atoms present, they are named as meth, eth, prop, but and so on.
-The name of the functional group is attached by removing the ‘e’ and replacing it with the name of the functional group.

Complete step by step answer:
IUPAC stands for “International Union of Pure and Applied Chemistry”. It is an endeavour governing chemical nomenclature and terminology including naming of new elements in the periodic table. For the naming of hydrocarbons, it has a fixed set of rules which are followed. Some rules following while naming alkanes are:
1.Identify the parent chain and the number of carbon atoms present in the parent chain.
2.Identify and locate the functional group in the compound.
3.Numbering the chain such that the substituents attached to the parent chain are assigned the lowest value possible.
4.Assemble the name while listing groups in alphabetical order.
5.Use of prefixes like di, tri, tetra etc. when several groups of the same kind are attached to the ring.
In the question, the compound given contains only one carbon atom. Thus, it will be named methane. The functional group attached to the hydrocarbon is an amine group. So, we will replace the ‘e’ in methane with amine. Thus, the IUPAC name of the compound will be methanamine.

The correct option will be option C, i.e. methanamine.

Note:
The common name of a compound with one functional group mostly contains the parent chain in the form of an alkyl group followed by the functional group. In the question given, the common name of ${\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{H}}_{\text{2}}}$ is methylamine.