Arrange the following in increasing order of their basic strength :
` C_2 H_5 NH_2 . C_6 H_5 NH_2 ,CH_2 and (C_2 H_5) NH `

Explanation

To arrange the compounds \( C_2H_5NH_2 \), \( C_6H_5NH_2 \), and \( (C_2H_5)NH \) in increasing order of their basic strength, we will analyze the basicity of each compound based on the structure and the effects of substituents.

### Step 1: Identify the Compounds
- \( C_2H_5NH_2 \) is Ethylamine (a primary amine).
- \( C_6H_5NH_2 \) is Aniline (an aromatic amine).
- \( (C_2H_5)NH \) is Diethylamine (a secondary amine).

### Step 2: Understand Basicity
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