Paragraph: Treatment of compound $\mathbf{O}$ with $\mathrm{KMnO}_{4} / \mathrm{H}^{+}$gave $\mathbf{P}$, which on heating with ammonia gave $\mathbf{Q}$. The compound $\mathbf{Q}$ on treatment with $\mathrm{Br}_{2} / \mathrm{NaOH}$ produced $\mathbf{R}$. On strong heating, $\mathbf{Q}$ gave $\mathbf{S}$, which on further treatment with ethyl $2-$bromopropanoate in the presence of $\mathrm{KOH}$ followed by acidification, gave a compound $\mathbf{T}$.

Question: The compound $\mathbf{R}$ is

• Correct answer
  A

  
• B

  
• C

  
• D

  

Solution

Q to R is Hoffmann's bromamide degradation reaction
S to T is Gabriel's phthalimide systhesis

Hence, the correct answer is option: 'A'.