The correct order of increasing acidic strength is:
| 1. | Phenol < Ethanol < Chloroacetic acid < Acetic acid |
| 2. | Ethanol < Phenol < Chloroacetic acid < Acetic acid |
| 3. | Ethanol < Phenol < Acetic acid < Chloroacetic acid |
| 4. | Chloroacetic acid < Acetic acid < Phenol < Ethanol |
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