Question:

The correct order of basic strength of $CH _{3} NH _{2}$ (I), $\left( CH _{3}\right)_{2} NH$ (II), $\left( CH _{3}\right)_{3} N$ (III), $C _{6} H _{5} CH _{2} NH _{2}$ (IV) in gaseous phase is

Updated On: Aug 15, 2022
  • IV < III < II < I
  • IV < III < I < II
  • I < II < III < IV
  • IV < I < II < III
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The Correct Option is D

Solution and Explanation

In gaseous phase, the basic strength of alkylamines follows the following order $3^{\circ}>2^{\circ}>1^{\circ}$ This is because of the presence of electron releasing $- CH _{3}$ group which increases the electron density over nitrogen and thus, makes the more availability of lone pair for donation. Hence, the correct order of basic strength is
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Concepts Used:

Amines

Amine is a type of compound which is derived from ammonia (NH3). According to Organic chemistry, they are basically classified as the functional groups of the organic nitrogen compounds that contain nitrogen atoms with a lone pair.

Amine - Types

Primary Amines:

It is formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group. Amino acids and methyl amine are the best examples that why aromatic amines include aniline.

Secondary Amines:

Amines that have two organic substitutes either alkyl or aryl ones or both and are bound to the nitrogen together with one hydrogen are termed as secondary amines. For Example, Dimethylamine.

Tertiary Amines:

Tertiary Amines are the amines where the nitrogen consists of three organic substitutes. For example, Trimethylamine and EDTA.