Arrange the following in increasing order of their basic strength :
` CH_3 NH_2 , (CH_3)_2 NH , (CH_3)_3 N, C_6 H_5 NH_2 ,C_6 H_5 CH_2 NH_2`

Explanation

To arrange the given amines in increasing order of their basic strength, we need to consider the structural factors affecting the basicity of amines, including steric hindrance and the electron-donating or withdrawing effects of substituents.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are:
- CH₃NH₂ (Methylamine - Primary amine)
- (CH₃)₂NH (Dimethylamine - Secondary amine)
- (CH₃)₃N (Trimethylamine - Tertiary amine)
...