Question

Which of the following is ${\mathbf{3}}^\circ$ amine
A. ${\left( {{\mathbf{C}}{{\mathbf{H}}_{\mathbf{3}}}} \right)_{\mathbf{3}}}{\mathbf{N}}$
B. ${\left( {{\mathbf{C}}{{\mathbf{H}}_{\mathbf{3}}}} \right)_{\mathbf{2}}}{\mathbf{N}}{\text{ }}{\mathbf{H}}$
C. $\;\left( {{\mathbf{C}}{{\mathbf{H}}_{\mathbf{3}}}} \right){\text{ }}{\mathbf{N}}{\text{ }}{{\mathbf{H}}_{\mathbf{2}}}$
D. ${\mathbf{N}}{{\mathbf{H}}_{\mathbf{3}}}$

Answer 1

In the given question we will mainly understand what is tertiary amine or three-degree amine is. We already know that amines are biological derivatives of ammonia$\left( {N{H_3}} \right)$, in which one or more of the three are replaced with a carbon group.

Complete Step by step answer: We distinguish that amines are Nitrogen-Containing Functional Groups and Amines are plentiful in nature. Amines can be classified into three types that are primary amine or we can say one degree amine ($1^\circ$), secondary amine or two degree amine ($2^\circ$), and lastly tertiary amine or three degree amine ($3^\circ$), all this depends upon how many number of carbon groups are linked to the nitrogen atom.
$N{H_3}$-Ammonia
$R - N{H_2}$- $1^\circ$Amine
$R - HN - R'$- $2^\circ$Amine
$R - R'' - N - R'$- $3^\circ$ Amine
Therefore, Trimethylamine is a tertiary amine that is ammonia in which each hydrogen atom is replaced by a methyl group. It plays a role as a human xenobiotic metabolite. So, it is a tertiary amine and is a member of methylamines. It is a conjugate base of a trimethylammonium.
From the above content we can say that $3^\circ$Amine or tertiary amine has three hydrogens that are replaced by functional groups. Thus, no hydrogen group is present in it.

Hence, the correct answer is A.

Note: as amines are a chief constituent of nucleic acids, proteins and enzymes, alkaloid drugs, many others. The $3^\circ$amines, meanwhile they do not hydrogen bond to each other, so they have boiling points which are similar to hydrocarbons of the same molecular weight.