Solution:
Phenol is less acidic than a carboxylic acid (acetic acid). Nitro
group from para position exert electron withdrawing resonance
effect, increases acid strength. Therefore, phenol is less acidic
than p-nitro phenol.
On the other hand, methoxy group from para position, donate
electrons by resonance effect, decreases acid strength of phenol.
Also ethanol is weaker acid than phenol due to resonance
stabilisation in phenoxide ion.
