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

Identify the longest chain of the carbon as the root. The main functional group is to be written as a suffix and the substitute is written as a prefix. The sequence of the naming should be in the way:
Prefix + root + suffix

Complete step by step answer:
The longest chain contains one carbon atom and one N atom. So it is the root. Since the compound contains a ${\text{N}}{{\text{H}}_{\text{2}}}$ molecule and a ${\text{C}}{{\text{H}}_3}$molecule, hence the name would contain amine and methyl.
We now assign numbers to the carbon and the nitrogen atom in the following way,

In the compound, we see that the 1 position contains the ${\text{N}}{{\text{H}}_{\text{2}}}$ group and the 2 position contains the ${\text{C}}{{\text{H}}_3}$ group.
From this we can conclude that the name of the compound will be methylamine.
Therefore, out of the given options, A is the correct answer.

Additional information:
Methylamine is a simple primary amine. This compound is an organic colorless compound. Commercially methylamine can be prepared by the reaction of methanol with that of ammonia.
${\text{C}}{{\text{H}}_3}{\text{OH}} + {\text{N}}{{\text{H}}_{\text{3}}} \to {\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{H}}_{\text{2}}} + {{\text{H}}_{\text{2}}}{\text{O}}$

Note:
The rule set by the International union of pure and applied chemistry (IUPAC) must always be followed. For naming, first identify the main chain and then number the carbon atoms in the chain. Secondly, identify the substituents and then name the compound using suffix and prefix. The counting of the number of carbon atoms is always done from the side in which the main functional group is assigned with a lesser number.