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Simple amines are given common names. When two or more alkyl or aryl groups are bound to the nitrogen atom in a compound, they are listed alphabetically. Di and tri are prefixes that denote two or three identical substituents.

To find the common name.

The following is the structure of the given compound:

The compound contains a propyl group $\left(−{\mathrm{CH}}_2−{\mathrm{CH}}_2−{\mathrm{CH}}_3\right),$that is connected to the nitrogen atom of the amine group.

As a result, propylamine is the common name for this compound.

To find the common name.

The following is the structure of the given compound:

The amine group's nitrogen atom is linked to the methyl group $\left(−{\mathrm{CH}}_3\right)$and the propyl group$\left(−{\mathrm{CH}}_2−{\mathrm{CH}}_2−{\mathrm{CH}}_3\right).$

This compound is also known as methyl propylamine.

To find the common name.

The following is the structure of the given compound:

One methyl group $(-C{H}_3)$and two ethyl groups $(-C{H}_2-C{H}_3)$ are tethered to the nitrogen atom of the amine group in this compound.

As a result, diethyl methylamine is the common name for this compound.