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(A) The acidic strength of carboxylic acids is determined by the stability of the conjugate base (carboxylate ion).Electron-withdrawing groups ($-I$ e

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$CF_3COOH > CHCl_2COOH > HCOOH > C_6H_5CH_2COOH > CH_3COOH$

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(A) The acidic strength of carboxylic acids is determined by the stability of the conjugate base (carboxylate ion).Electron-withdrawing groups ($-I$ effect) increase acidity by stabilizing the negative charge,while electron-donating groups ($+I$ effect) decrease acidity.The order of $-I$ effect strength is $CF_3 > CHCl_2 > H > C_6H_5CH_2 > CH_3$.$CF_3$ is a very strong electron-withdrawing group,making $CF_3COOH$ the strongest acid.$CHCl_2$ is also electron-withdrawing,making $CHCl_2COOH$ stronger than $HCOOH$.$HCOOH$ is stronger than $C_6H_5CH_2COOH$ (where the phenyl group has a slight $+I$ effect) and $CH_3COOH$ (where the methyl group has a $+I$ effect).Thus,the correct order is $CF_3COOH > CHCl_2COOH > HCOOH > C_6H_5CH_2COOH > CH_3COOH$.

Which of the following is the correct order of acidic strength?

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Which of the following is the correct order of acidic strength?

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What is the correct order of increasing acidic strength for the following compounds?
$I. CH_3CO_2H$
$II. MeOCH_2CO_2H$
$III. CF_3CO_2H$
$IV. (CH_3)_2CHCO_2H$