Arrange the following in the decreasing order: ClCH2COOH, Cl3CCOOH, CH3COOH, Cl2CHCOOH

The greater the number of electron-withdrawing substituents, the greater the dispersal of the negative charge and hence stronger will be the acid. Hence, the order of acidity is


Strength of carboxylic acids

Carboxylic acids are weak acids because they only partially ionise in solution. Their solutions do not contain many hydrogen ions than a strong acid solution at the same concentration. Acetic acid is ten times weaker than formic acid confirming the electron-donating character of an alkyl group relative to hydrogen.

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