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The acidstrength of saturated aliphaticcarboxylicacids dependsmainlyupon the inductive effectof substitutent and its position with respect to the COOH group. Theacidstrenghtof aromaticcarboxylicacids, one the other handdepends upon boththe inductiveand theresonanceaffect of thesubsistuents . Theirrends are , however, similarto thoseof aliphaticacidsin the followingtwo differneces. (a)Theacidsweakingeffectof electrondonatingsubstituentsand acid strenghteffectof the electron- withdrawingsubstituents is more pronoucedat p - positionthat at m - posititon. (b) Due to ortho effect o-substited benzoicacidsare usallystrongerthan benzoic andacidregardlessof thenatureof substituent whetherelectrondonatingdonatingor electronwithdrawing. Amongthe followingthe strongestacid is : |
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Answer» `CH_(3)COOH` |
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