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Q.
The correct order of increasing acidic strength is_____ .
Aldehydes Ketones and Carboxylic Acids
Solution:
Due to formation of more stable conjugate base after removal of $H$ from phenol, therefore phenol is more stable than alcohol. On the other hand, carboxylic acid
is more acidic than phenol due to formation of more stable conjugate base after removal of $H$ as compared to phenol. Chloroacetic acid is more acidic than acetic acid due to the presence of electron withdrawing chlorine group attached to a carbon of carboxylic acid. Hence, correct choice is (c)