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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.
People who eat large quantities of foods high in phenol or foods containing salicylates and/or additives may experience some of these negative side affects: 1  laughing at inappropriate times (at night or when something is not funny). 2  strange rashes that appear on the body.