CBSE 2025 · Region 5 · Set 2 · Q27 · 3 marks

Identify $\displaystyle \mathrm{P}, \mathrm{Q}$ and R in the following reaction sequence : \[\begin{aligned} \mathrm{P} & \xrightarrow{\mathrm{NH}_{3}} \mathrm{CH}_{3} \mathrm{COO}^{-} \mathrm{NH}_{4}^{+} \xrightarrow{\Delta} \mathrm{Q} \\ & \mathrm{PCl}_{5} \mathrm{R} \end{aligned} \]

CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.