The correct order of basicity of amines in water is which of the following?

(CH₃)₂NH > CH₃NH_{2 > (CH3)3N}

The correct answer is OPTION 1 - (CH₃)₂NH > CH₃NH_{2 > (CH3)3N}

The correct answer is Option 1 :

$$(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$$

In aqueous solution, the basicity of amines depends on:

• +I effect of alkyl groups, which increases electron density on nitrogen.

• Solvation of the protonated amine ion by water.

Secondary amines have strong +I effect and still get effectively solvated, making them the most basic in water.

Tertiary amines, although having a stronger +I effect, suffer from steric hindrance and poor solvation of the protonated ion, so their basicity decreases.

Hence, the order of basicity in water is:

$$(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$$