TS EAMCET · Chemistry · Amines

Which one of the following compounds undergoes Hoffmann degradation reaction?

A ${CH}_{3} CN$
B ${CH}_{3} {CONHCH}_{3}$
C ${CH}_{3} {CONH}_{2}$
D ${CH}_{3} NC$

Verified Solution

Answer & Solution

Correct Answer

(C) ${CH}_{3} {CONH}_{2}$

Step-by-step Solution

Detailed explanation

This is Hoffmann bromamide reaction in which 1° amine is obtained having one C atom less than the starting amide. Hoffmann degradation gives the primary amine from the primary amide. The reagent used in this is Br2+KOH. CH3CONH2 is only the primary amide from all.

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.

Same subject

	List-1(Chemical)		List-2(Use)
A	KOH	I	Coolant
B	Na(l)	II	Antacid
C	Li	III	Electrochemical Cells
D	\(\mathrm{Mg}(\mathrm{OH})_2\)	IV	Absorbent for \(\mathrm{CO}_2\)

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