Is an amine formed when one or more nitrogen atoms from the ammonia molecule are replaced by an alkyl group?

Answer 1

An ALKYLAMINE is formed when 1 or more hydrogens of the ammonia is replaced by an alkyl group.

The ammonia molecule is #NH_3#; it has only 1 nitrogen atom. Each hydrogen can be replaced by a hydrocarbyl group to give for instance, methylamine. #H_2NMe#, or phenylamine, #H_2NPh#. Trialkylamines, e.g #NMe_3#, or #NEt_3# are also very common.

The nitrogen atom can become quaternized to give quaternary ammonium salts such as #NMe_4^+#, where the nitrogen centre has a formal positive charge, and there is a negative counterion. Their formation can be represented by the following reaction:

#R'Cl + NR_3 rarr R_3R'N^+Cl^-#

These are analogues of ammonium chloride, #NH_4Cl#, an ammonium salt.

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Answer 2

Paisley Boney

Yes, when one or more hydrogen atoms in the ammonia molecule are replaced by an alkyl group, the resulting compound is an amine.

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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.