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Correct increasing order of acidity is as follows:

1. H2O, C2H2, H2CO3, Phenol
2. C2H2, H2O, H2CO3, Phenol
3. Phenol, C2H2, H2CO3, H2O
4. C2H2, H2O, Phenol, H2CO3

Correct answer: C2H2, H2O, Phenol, H2CO3

Solution

Acidity depends on the ability to donate protons. C2H2 (ethyne) is the least acidic, followed by H2O, then phenol, and H2CO3 (carbonic acid) is the most acidic due to its stronger acidic nature.

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