Which of the following is a primary amine?

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Multiple Choice

Which of the following is a primary amine?

Primary amines are defined by nitrogen bonded to exactly one carbon atom and bearing two hydrogens (N has two N–H bonds). In the molecule CH3-NH2, the nitrogen sits next to a single carbon (the methyl group) and has two hydrogens, so it fits this pattern perfectly. The other simple amine with a benzene ring, C6H5NH2, also has the nitrogen attached to one carbon (the aryl group) and two hydrogens, so it is also a primary amine, though it’s an aromatic example. A structure where nitrogen is bonded to two carbons and has one hydrogen is a secondary amine, and a structure where nitrogen is bonded to three carbons has no N–H bonds and is a tertiary amine. Hence CH3-NH2 clearly demonstrates a primary amine.

Primary amines are defined by nitrogen bonded to exactly one carbon atom and bearing two hydrogens (N has two N–H bonds). In the molecule CH3-NH2, the nitrogen sits next to a single carbon (the methyl group) and has two hydrogens, so it fits this pattern perfectly. The other simple amine with a benzene ring, C6H5NH2, also has the nitrogen attached to one carbon (the aryl group) and two hydrogens, so it is also a primary amine, though it’s an aromatic example. A structure where nitrogen is bonded to two carbons and has one hydrogen is a secondary amine, and a structure where nitrogen is bonded to three carbons has no N–H bonds and is a tertiary amine. Hence CH3-NH2 clearly demonstrates a primary amine.

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