Arrange the following compounds in an increasing order of their solubility in water:
`C-6H_5NH_2(C_2H_5)_2NH,C_2H_5NH_2`

Explanation

To determine the increasing order of solubility in water for the compounds C6H5NH2 (aniline), (C2H5)2NH (diethylamine), and C2H5NH2 (ethylamine), we need to analyze their structures and the ability of each compound to form hydrogen bonds with water.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- C6H5NH2: This is aniline.
- (C2H5)2NH: This is diethylamine.
- C2H5NH2: This is ethylamine.
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