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well it is explained by ortho effect........ any type of substituient , when attached to ortho position to -COOH , its acid strenght is greater than that of benzoic acid.......... it arises bcoz due to steric factors the coplanarity of -COOH groupt with benzene ring is lost.dat's why resonance is not possible with benzene ring and -COOH group ,as a result ......acid strenght increasese.......... u will understand better by drawing the resonance structures......
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