Match the compounds in LIST- I with the observations in LIST- II , and choose the correct option. LIST- I…

$\left(\mathrm{I}\right)$

Since it contains both carbon and nitrogen so its sodium fusion extract with boiling ${\mathrm{FeSO}}_4$, followed by acidification with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ gives Prussian blue colour.

${\mathrm{Fe}}^{2+}+6{\mathrm{CN}}^{-}\to {\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-}$

$$\begin{gathered} 3{\left[\mathrm{Fe}\left({\mathrm{CN}}_6\right)\right]}^{-4}+4{\mathrm{Fe}}^{3+}\stackrel{{\mathrm{xH}}_2\mathrm{O}}{\to }{\mathrm{Fe}}_4{\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}_3.{\mathrm{xH}}_2\mathrm{O} \\ \mathrm{Prussian} \mathrm{blue} \end{gathered}$$

$\mathrm{I}-\left(\mathrm{P}\right)$,S

$\left(\mathrm{II}\right)$  $\mathrm{o}-$Cresol

 Violet coloured complex

$\left(\mathrm{III}\right)$ Cysteine

Since it has both, sulphur and nitrogen, so its sodium fusion extract will give blood red colour with ${\mathrm{Fe}}^{3+}$ and it has carboxylic group so it will give effervescence with ${\mathrm{NaHCO}}_3$.

$\left(\mathrm{IV}\right)$ Caprolactam

Its sodium fusion extract will give Prussian blue colour on boiling with ${\mathrm{FeSO}}_4$ followed by acidification with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$.