MHT CET · Chemistry · Amines

Which of the following conversions is Hofmann Elimination reaction?

A \(\mathrm{RCONH}_2 \xrightarrow{\mathrm{Br}_2, \mathrm{KOH}_{(\mathrm{aq})}} \mathrm{R}-\mathrm{NH}_2\)
B \(\mathrm{R}-\mathrm{NH}_2 \xrightarrow[\text { excess }]{\mathrm{R}-\mathrm{X}} \mathrm{R}_4 \mathrm{NX}\)
C \(\mathrm{R}_4 \mathrm{NX} \xrightarrow[\Delta]{\text { moist } \mathrm{Ag}_2 \mathrm{O}}\) Alkene \(+\mathrm{R}_3 \mathrm{~N}\)
D \(\mathrm{RCN} \xrightarrow{\mathrm{Na} / C_2 \mathrm{H}_5 \mathrm{OH}} \mathrm{RCH}_2 \mathrm{NH}_2\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\mathrm{R}_4 \mathrm{NX} \xrightarrow[\Delta]{\text { moist } \mathrm{Ag}_2 \mathrm{O}}\) Alkene \(+\mathrm{R}_3 \mathrm{~N}\)

Step-by-step Solution

Detailed explanation

The Hofmann elimination reaction is a reaction in which a primary amide (RCONH2) undergoes elimination to form an amine and an alkene. This is typically done using excess aqueous potassium hydroxide \((\mathrm{KOH})\).

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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