To draw a primary amine, start by drawing the longest carbon atom chain of the molecule. Next, connect the amine functional group according to the location given in the name of the amine. Finally, attach all substituent groups according to the location given in the nomenclature. To draw a secondary or tertiary amine, start by drawing a nitrogen atom with three connecting bonds. Attach each substituent group, listed in the nomenclature by the prefix N-, to the nitrogen atom (two groups if it is a secondary amine and three groups if it is a tertiary amine). For secondary amines, attach a hydrogen atom to the third bond of the nitrogen atom. A. Draw the structure of 1,4-hexanediamine.
B. Draw the structure of 2,4-difouroaniline.

See figure 1 and figure 2

Explanation:

We can analyze each structure:

A. Structure of 1,4-hexanediamine

For this molecule, we must start with a six-carbon chain. Since, in the name of the molecule we have the prefix "hex", then we have to name the carbons. The first carbon will be the one on the right and the sixth on the left. Finally, we must place two amino groups on carbons 1 and 4 (See figure 1).

B. Draw the structure of 2,4-difluoroaniline

For this molecule, we must start with the aniline molecule. In this molecule, we have an amino group attached to a benzene ring. Carbon number 1 will be the carbon that is attached to the amino group, carbon number 2 must be placed in a clockwise direction. Finally, we must place two fluorine atoms on carbons 2 and 4 (See figure 2).

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explanation: