Q18 / 75 · JEE Main 2026 (08 April Shift 2) · Chemistry
Which statements are True?
A. In Hoffmann bromamide degradation, $4$ moles of NaOH and $2$ moles of Br$_2$ are consumed per mole of an amide
B. Hoffmann bromamide reaction is not given by alkyl amides.
C. Primary amines can be synthesized by Hoffmann bromamide degradation.
D. Secondary amide on reaction with Br$_2$ and NaOH will give secondary amine.
E. The by-products of Hoffmann degradation are Na$_2$CO$_3$, NaBr and H$_2$O.
Choose the correct answer from the options given below:
A. In Hoffmann bromamide degradation, $4$ moles of NaOH and $2$ moles of Br$_2$ are consumed per mole of an amide
B. Hoffmann bromamide reaction is not given by alkyl amides.
C. Primary amines can be synthesized by Hoffmann bromamide degradation.
D. Secondary amide on reaction with Br$_2$ and NaOH will give secondary amine.
E. The by-products of Hoffmann degradation are Na$_2$CO$_3$, NaBr and H$_2$O.
Choose the correct answer from the options given below:
- AA, C and E only
- BB, C and D only
- Correct answerCC and E only
- DC, D and E only
Solution
The balanced chemical equation for Hoffmann bromamide degradation is:
$\text{R-CONH}_2 + \text{Br}_2 + 4\text{NaOH} \rightarrow \text{R-NH}_2 + \text{Na}_2\text{CO}_3 + 2\text{NaBr} + 2\text{H}_2\text{O}$
Statement A is false because $1$ mole of $\text{Br}_2$ and $4$ moles of $\text{NaOH}$ are consumed per mole of amide.
Statement B is false because primary alkyl amides readily undergo this reaction.
Statement C is true as the primary product of this reaction is a primary amine.
Statement D is false because the reaction is strictly given by primary amides ($\text{R-CONH}_2$), not secondary amides.
Statement E is true as the by-products formed are $\text{Na}_2\text{CO}_3$, $\text{NaBr}$, and $\text{H}_2\text{O}$.
Therefore, only statements C and E are true.
Answer: C and E only
$\text{R-CONH}_2 + \text{Br}_2 + 4\text{NaOH} \rightarrow \text{R-NH}_2 + \text{Na}_2\text{CO}_3 + 2\text{NaBr} + 2\text{H}_2\text{O}$
Statement A is false because $1$ mole of $\text{Br}_2$ and $4$ moles of $\text{NaOH}$ are consumed per mole of amide.
Statement B is false because primary alkyl amides readily undergo this reaction.
Statement C is true as the primary product of this reaction is a primary amine.
Statement D is false because the reaction is strictly given by primary amides ($\text{R-CONH}_2$), not secondary amides.
Statement E is true as the by-products formed are $\text{Na}_2\text{CO}_3$, $\text{NaBr}$, and $\text{H}_2\text{O}$.
Therefore, only statements C and E are true.
Answer: C and E only
Hence, the correct answer is option: 'C'.