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What is the difference between primary and secondary amines?

Answer 1

#"Primary, secondary, tertiary"# refers to the degree of hydrocarbyl substitution on the ammonia molecule.

Ammonia is #NH_3#. A primary, #1""^@#, amine is #RNH_2#, that is it has one hydrocarbyl substituent on nitrogen. A secondary, #2""^@#, amine is #R_2NH#, and a tertiary, #3""^@#, amine is #R_3N#. A quaternary ammonium salt is #R_4N^+#.

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Answer 2

Elias Aguila

Primary amines have one alkyl or aryl group attached to the nitrogen atom, while secondary amines have two alkyl or aryl groups attached to the nitrogen atom.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.