JEE Mains · Chemistry · STD 12 - 9. Amines

Given below are two statements: Statements\(-I :\) In Hofmann degradation reaction, the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom. Statement\(-II :\) The group is migrated in Hofmann degradation reaction to electron deficient atom. In the light of the above statement, choose the most appropriate answer from the options given below

A Both Statement\(-I\) and Statement\(-II\) are correct
B Both Statement\(-I\) and Statement\(-II\) are incorrect
C Statement\(-I\) is correct but Statement\(-II\) is incorrect
D Statement\(-I\) is incorrect but Statement\(-II\) is correct

Verified Solution

Answer & Solution

Correct Answer

(D) Statement\(-I\) is incorrect but Statement\(-II\) is correct

Step-by-step Solution

Detailed explanation

\(R - CO - NH _{2}+ Br _{2}+ NaOH \rightarrow\) \(R - NH _{2}+ Na _{2} CO _{3}+ NaBr + H _{2} O\) \(R - CO - NH _{2}+\overline{ O }H \rightarrow R - CO -\overline{ N }H \stackrel{ Br _{2}}{\longrightarrow}\)…

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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