Phenols acidity?

Question

acidity is affected by activator groups and deactivator groups.
Meaning: the acidity
phenol +deactivator group such as(NO2)>phenol>phenol+activator group such as (OCH3)

Am I right ?

Answer 1

The acidity of a phenol is increased by:
1. any electron-withdrawing group, which will weaken the O-H bond.
2. any group which will, by resonance, stabilise the phenoxide anion.

Answer 2

In phenol --OH group increase the electron density on benzene ring at ortho & para positions.
when a ring deactivator such as---NO2 group is attached to benzene at ortho or para position,it withdraws the electrons from benzene ring,which in turn withdraw electrons from --OH group,thus the electron density is decreased on oxygen so it withdraw the electrons of O--H bond,hence the release of H+ ion become easier, so the acidity increases.
In case of electron withdrawing groups if it is attached to m-position it do not effect the acidity ,because electron density at meta position is less.
In case of ring activator groups such as ---OCH3, they increases the electron density on benzene ring ,due to which the electron density is increased on oxygen & release of H+ion become difficult so its acidity is decreased as compared to phenol.
But phenol do not have any activator or deactivator group.
so acidity order becomes as you asked.

note:----- withdraw of electron from benzene and release of electron due to activator group occur due to resonance