Arrange the following in the increasing order of acidic strength,
Water, acetylene, ethanol, acetic acid and HCl

Explanation

To arrange the compounds (Water, Acetylene, Ethanol, Acetic Acid, and HCl) in the increasing order of acidic strength, we need to analyze the ability of each compound to donate protons (H⁺ ions) and the stability of the resulting anions. Here is the step-by-step solution:

### Step 1: Identify the Compounds
The compounds we need to consider are:
1. Water (H₂O)
2. Acetylene (C₂H₂)
3. Ethanol (C₂H₅OH)
4. Acetic Acid (CH₃COOH)
...