The weakest acid among the following is__________.

C H_{3} C O O H

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C H_{3} C H_{2} C O O H

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(C H_{3})_{2} C H C O O H

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(C H_{3})_{3} C C O O H

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Solution

The correct option is D $(C H_{3})_{3} C C O O H$
Electron donating groups decrease the acidity of carboxylic acid as they destabilize the conjugate base.

Methyl is an electron-donating group.

In $(C H_{3})_{3} C C O O H$ , due to the presence of $3$ methyl groups (electron donation, in this case, is maximum), the stability of the carboxylate anion decreases, and hence, it is the weakest acid among all given options.

The order of strength of acids is as follows:
$(C H_{3})_{3} C C O O H < (C H_{3})_{2} C H C O O H < C H_{3} C H_{2} C O O H < C H_{3} C O O H$
Hence, the weakest acid is $(C H_{3})_{3} C C O O H$ .

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