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Effects of substituents on the acidity of phenols: Existence of electron attracting group, (for example-NO2, -X, - NR, -CN, -CHO, -COOH) on the benzene ring increases the acidity of phenol since it enables the ring to draw much more electrons from the phenoxy oxygen and so releasing easily the proton.
Phenols. Various compounds of phenols are common in plant tissues, each of which may enclose a number of grams per every kilogram. Phenol compounds present in plant tissues begin to blend as a result of stimulants on the outer surface like ultraviolet radiation, microbial infections or and chemical changes.