Total number of hydroxyl groups present in a molecule of the major product P is ..............

Total number of $$cis\,N - Mn - Cl$$ bond angles (that is $$Mn - N$$ and $$Mn - Cl$$ bonds in cis positions) present in a molecule of $$cis[Mn{(en)_2}C{l_2}]$$ complex is ..................

(en = NH₂CH₂CH₂NH₂)

The amount of water produced (in g) in the oxidation of 1 mole of rhombic sulphur by conc. HNO₃ to a compound with the highest oxidation state of sulphur is ..............

(Given data : Molar mass of water = 18 g mol^$$-$$1)

Total number of isomers, considering both structural and stereoisomers of cyclic ethers with the molecular formula C₄H₈O is .................