Among the following, the number of compounds that can react with PCl₅ to given POCl₃ is _____________.

O₂, CO₂, SO₂, H₂O, H₂SO₄, P₄O₁₀

The volume (in mL) of 0.1 M AgNO₃ required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of $$[Cr{({H_2}O)_5}Cl]C{l_2}$$, as silver chloride is close to ____________.

The maximum number of isomers (including stereoisomers) that are possible on mono-chlorination of the following compound, is ____________.

Match the reactions in Column I with appropriate types of steps/reactive intermediate involved in these reactions as given in Column II :

	Column I		Column II
(A)		(P)	Nucleophilic substitution
(B)		(Q)	Electrophilic substitution
(C)		(R)	Dehydration
(D)		(S)	Nucleophilic
		(T)	Carbanion