KCET · Chemistry · Carboxylic Acid Derivatives

The relative acidic strengths of benzoic acid, \(o\)-toluic acid and \(p\)-toluic acid is of the decreasing order

A \(o\)-toluic acid \(>p\)-toluic acid \(>\) benzoic acid
B \(p\)-toluic acid \(>\) benzoic acid \(>0\)-toluic acid
C 0 -toluic acid \(>\) benzoic acid \(>p\)-toluic acid
D \(p\)-toluic acid \(>0\)-toluic acid \(>\) benzoic acid

Verified Solution

Answer & Solution

Correct Answer

(C) 0 -toluic acid \(>\) benzoic acid \(>p\)-toluic acid

Step-by-step Solution

Detailed explanation

+ I effect showing groups like \(\mathrm{CH}_{3}\) when present decreases the acidic strength of carboxylic acids but ortho toluic acid is more acidic due to ortho effect.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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