Question

Correct the increasing order of acidity is as

• A. $H_2O,C_2H_2,H_2CO_3$, phenol
• B. $C_2H_2, H_2O, H_2CO_3,$ phenol
• C. Phenol, $C_2H_2,H_2CO_3,H_2O$
• D. C$_2H_2,H_2O, phenol \, and \, H_2CO_3$

Answer 1

The Correct Option is D

C$_2H_2$ have acidic nature but it is less acidic than
water but phenol is more acidic than water due to
resonance stabilisation of phenoxide ion. H$_2CO_3$ is
most acidic due to resonating stabilisation of
carbonate ion (CO$_3^{2-}$).
Thus, the correct order is
$ \, \, \, \, \, \, C_2H_2 < H_20 < phenol < H_2CO_3$