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Which of the following is the stronger acid?

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in Chemistry – Class 12 by (188k points)
Which of the following is the stronger acid?

(a) Acetic acid

(b) Propanoic acid

(c) Isobutyric acid

(d) 2,2-Dimethylpropanoic acid

The question was asked during an interview for a job.

My question is taken from Carboxylic Acids Chemical Reactions topic in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

1 Answer

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Best answer
Correct choice is (a) Acetic acid

Best explanation: As the size of alkyl group (electron releasing) increases, the electron density on the O of OH group increases, and makes release of H^+ ion more difficult. Thus, the release of proton from acetic acid will be easier compared to the higher acids, and is therefore the stronger acid.

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