Which of the following is the strongest acid?

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Question

(C) The acidity of carboxylic acids is increased by the presence of electron-withdrawing groups ($-I$ effect) and decreased by electron-donating group

Vedclass · Accepted Answer

$CH_2ClCOOH$

Vedclass · Answer

(C) The acidity of carboxylic acids is increased by the presence of electron-withdrawing groups ($-I$ effect) and decreased by electron-donating groups ($+I$ effect).In $CH_2ClCOOH$,the chlorine atom exerts a strong $-I$ effect,which stabilizes the carboxylate anion significantly.Comparing the options:$CH_3CH_2COOH$ and $CH_3COOH$ have alkyl groups which show $+I$ effect,making them weaker acids.$CH_2ClCH_2COOH$ has the chlorine atom further away from the carboxyl group,reducing its $-I$ effect compared to $CH_2ClCOOH$.Therefore,$CH_2ClCOOH$ is the strongest acid among the given options.

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