Question

Arrange the following in increasing order of their basic strength (1) methylamine (2) dimethylamine (3) trimethylamine (4) aniline

Answer 1

Solution :-

$\underline{\boxed{\bf{\red{Basic\:character\:of\:amines:}}}}$

→ Amines are basic in nature due to the presence of lone pairs of electrons on nitrogen atom.

→ Aliphatic amines are stronger bases than ammonia due to +I effect of alkyl groups present in amines.

→ Aromatic amines are weaker bases than ammonia due to -I effect of aryl group.

→ Besides inductive effect, there ate other effects like steric effect, solvation effect, resonance effect which effect the basic strength of amines.

$\boxed{\sf{\purple{Basicity\propto\dfrac{+I\:effect}{-I\:effect}}}}$

Final answer,

✴ Aniline < Methylamine < Dimethylamine < Trimethylamine ✴

Answer 2

Explanation:

Solution :

Basic character of amines :

→ Amines are basic in nature due to the presence of lone pairs of electrons on nitrogen atom.

➡ Aliphatic amines are stronger bases than ammonia due to +I effect of alkyl groups present in amines.

→ Aromatic amines are weaker bases than ammonia due to -I effect of aryl group.

→ Besides inductive effect, there ate other effects like steric effect, solvation effect, resonance effect which effect the basic strength of amines.

Basicity x +I effect -I effect

Final answer,

* Aniline < Methylamine < Dimethylamine < Trimethylamine *