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Which of the following is the most acidic?

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

(a) Benzoic acid

(b) o-Toluic acid

(c) m-Toluic acid

(d) p-Toluic acid

This question was posed to me in semester exam.

I'd like to ask this question from Carboxylic Acids Chemical Reactions topic in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Best answer
Correct option is (b) o-Toluic acid

Easiest explanation: Although CH3 is an electron releasing group and should reduce the acidic character of acids by destabilizing it, the presence of CH3 group at ortho position has a reverse effect and increases the acidic strength compared to benzoic acid. This is due to a combination of stearic and electronic factors.

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