Question

Write the IUPAC name of the following compounds:
(a)-
(b)-

Answer 1

In both the compounds there is nitrogen and nitrogen is present as amine, so both the compounds are amines. If the chain of the carbon atoms is two then use ethyl term and if the chain of carbon atom is one then use methyl term.

Complete answer:
The given two compounds in the question are organic compounds in which the functional group is present as nitrogen atoms and the nitrogen atom is present as amine. In both the compounds, there are three different carbon chains present, as there is no hydrogen atom present to the nitrogen atom, therefore, both the compounds are tertiary amines.
In option (a), the three chains that are present in the nitrogen atoms are two ethyl groups and one methyl group. Therefore, the largest chain is of the ethyl group. In the IUPAC name of the following compound, we have to first the substituent groups of the amine group and add N to the chain. The naming should be done in alphabetic order.

In these two substituent chains are ethyl and methyl, alphabetically e comes before m, and the main chain will be ethanamine.
Therefore, its name will be N-Ethyl-N-methyl ethanamine.
In option (b), the three chains that are present to the nitrogen atoms are three ethyl groups. Therefore, the largest chain is of the ethyl group.

In these two substituent chains are ethyl groups, so we can use di in the prefix and the main chain will be ethanamine.
Therefore, its name will be N, N-Diethyl ethanamine.

Note:
Whenever we name secondary and tertiary amines, don’t forget to use N before the substituent carbon chains. If three carbon atoms chain is present then use propyl term, if four carbon atoms chain are present then use butyl term, etc.