Match the list I with list II.
List-I (Reagent):
(1) $\mathrm{H_2/Pd/BaSO_4}$
(2) (i) $\mathrm{CrO_2Cl_3/CCl_4}$ (ii) $\mathrm{H_3O^+}$
(3) $\mathrm{CO + HCl + AlCl_3}$
(4) $\mathrm{SnCl_2 +}$ dil. HCl
List-II (Name Reaction):
(P) Rosamund Reaction
(Q) Etard Reaction
(R) Gattermann Koch Reaction
(S) Stephen's Reaction