During sodium nitroprusside test of sulphide ion in an aqueous solution, one of the ligands coordinated to the metal ion is converted to

The complete hydrolysis of ICl, ClF₃ and BrF₅, respectively, gives :

Monocyclic compounds $\mathbf{P}, \mathbf{Q}, \mathbf{R}$ and $\mathbf{S}$ are the major products formed in the reaction sequences given below.

The product having the highest number of unsaturated carbon atom(s) is :