TS EAMCET · Chemistry · Carboxylic Acid Derivatives

Statement (A) Carboxylic acid can be obtained by the reaction of \(R-\mathrm{C} \equiv \mathrm{N}\) with \(\mathrm{H}_3 \stackrel{\oplus}{\mathrm{O}}\) under mild reaction conditions. Statement (B) Hydrolysis of \(R-\mathrm{C} \equiv \mathrm{N}\) in alkaline aqueous medium gives \(R-\mathrm{COON} \mathrm{Na}\) and \(\mathrm{NH}_3\) as products. The correct answer is

A Both (A) and (B) are correct
B Both (A) and (B) are not correct
C (A) is correct, but (B) is not correct
D (A) is not correct but (B) is correct

Verified Solution

Answer & Solution

Correct Answer

(D) (A) is not correct but (B) is correct

Step-by-step Solution

Detailed explanation

Carboxylic acid can be obtained by complete hydrolysis of \(R-\mathrm{CN}\). Therefore, statement \((A)\) is incorrect. When alkyl cyanide hydrolysed in presence of alkaline medium, \(R-\mathrm{COOO}^{-}+\mathrm{a}-\mathrm{Na}\) and ammonia gas are obtained Therefore, statement…

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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