Ortho�nitrophenol is less soluble in water than p� and m� nitrophenols why?
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Solution
Ortho-nitrophenol possesses intramolecular hydrogen bonding for which its solubility is less compared to ortho and meta-nitrophenol.
The nitro group and hydroxy group in the ortho-nitrophenol are in close proximity to each other to form intramolecular hydrogen bonding which is absent in para and meta-nitrophenol.
Para-nitrophenol:- 
Meta-nitrophenol:-
