Among formic acid,acetic acid, propanoic acid and phenol the strongest acid in water is

Options

A. formic acid
B. acetic acid
C. propanoic acid
D. phenol

Answer

a

Explanation

formic acid is strongest Acid.
Acidic strength order `H-underset(O)underset(||)(C) -OHgt overset(+1)CH_(3)-underset(O)underset(||)C-OHgtoverset(+1)CH_(3)-CH_(2)-underset(O)underset(||)C-OHgt`

`to` +I decrease acidic strength
`to` Carboxylic Acid are more acidic Then phenol
`R-underset(O)underset(||)C-OHLeftrightarrowR-underset(O)underset(||)C-overset ThetaOleftrightarrowR-C=underset(O^(Theta))underset(|)C=O`