Question

Why ortho salicylic acid is avidic than para salicylic acid?

Answer 1

The reason is STERIC INHIBITION OF RESONANCE effect.

ortho salicylic acid is ortho hydroxy benzoic acid. There exists steric hinderance due to OH in ortho position to COOH and also a Hydrogen bond formation through a six membered chelation, leading to easier loss of H (of -COOH)

which are actually not present in para salicyclic acid