Match the compound in List I with its colour in List II. List I: (P) $\mathrm{Fe}(\mathrm{OH}){}_3$, (Q) $\mathrm{Al}(\mathrm{OH}){}_3$, (R) $\mathrm{Cr}(\mathrm{OH}){}_3$, (S) $\mathrm{Fe}{}_4[\mathrm{Fe}(\mathrm{CN}){}_6]{}_3$. List II: (1) white, gelatinous; (2) deep (Prussian) blue; (3) reddish-brown; (4) grey-green.

1. AP-3, Q-1, R-4, S-2
2. BP-3, Q-4, R-1, S-2
3. CP-1, Q-3, R-4, S-2
4. DP-3, Q-1, R-2, S-4