which is more acidicA)ortho nitro phenolB)para nitro phenol

Dear paresh

Because in the ortho-isomer the proton on the -OH group can hydrogen-bond with one of the oxygen atoms of the -NO2 group, making it harder to lose the proton.
With the para-isomer this can't happen

hence para nitro phenol is more acidic

All the best.

AKASH GOYAL

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para nitro phenol is  more acidic because in orthonitro phenol there is intramolecular

hydrogen bonding present due to which is not capable of loosing its proton(H)...