KCET · Chemistry · Amines

Which one of the following gives amine on heating with amide?

A \(\mathrm{Br}_{2}\) in aqueous \(\mathrm{KOH}\)
B \(\mathrm{Br}_{2}\) on alcoholic \(\mathrm{KOH}\)
C \(\mathrm{Cl}_{2}\) in sodium
D sodium in ether

Verified Solution

Answer & Solution

Correct Answer

(A) \(\mathrm{Br}_{2}\) in aqueous \(\mathrm{KOH}\)

Step-by-step Solution

Detailed explanation

Hofmann bromamide reaction : this method is used for the preparation of any \(1^{\circ}\) amine as well as aniline. During the reaction amide is treated with \(\mathrm{Br}_{2}\) and alkali \((\mathrm{KOH})\) to get primary amine. This reaction is used to descend the series in which carbon atom is removed as carbonate ion \(\left(\mathrm{CO}_{3}^{2-}\right)\) reaction is given as

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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