Arrange the following in increasing order of their basic strength :
$CH _{3} NH _{2}( I ),\left( CH _{3}\right)_{2} NH ( II ),\left( CH _{3}\right)_{3} N ( III )$,
$C _{6} H _{5} CH _{2} NH _{2} (IV)$
Basic character depends upon the availability of lone pair of electrons over nitrogen for donation. Presence of electrons releasing group like $- CH _{3}$ increases the electron density over nitrogen, thus lone pair of nitrogen are more available for donation. Hence, basic character increases. But $3^{\circ}$ methyl amines are less basic as compared to $2^{\circ}$ and $1^{\circ}$ amines due to steric hindrance. Thus, the order of basic strength of the given compounds is
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.
