Column-I		Column-II
A)	${\mathrm{NH}}_3>{\mathrm{PH}}_3>{\mathrm{AsH}}_3>{\mathrm{SbH}}_3$	P)	Reducing property
B)	$\mathrm{KF}>\mathrm{KCl}>\mathrm{KBr}>\mathrm{KI}$	Q)	Heat of fusion (M.P)
C)	${\mathrm{H}}_2\mathrm{O}>{\mathrm{H}}_2\mathrm{S}>{\mathrm{H}}_2\mathrm{Se}>{\mathrm{H}}_2\mathrm{Te}$	R)	Thermal stability
D)	${\mathrm{CH}}_4<{\mathrm{SiH}}_4<{\mathrm{GeH}}_4<{\mathrm{SnH}}_4$	S)	Lewis basic character

	(A)	(B)	(C)	(D)
1)	RS	QRS	RS	Q
2)	QS	PQ	RS	Q
3)	PQ	PQ	S	P
4)	PQ	R	R	S

A) Lewis basic character and thermal stability decrease in the order ${\mathrm{NH}}_3>{\mathrm{PH}}_3>{\mathrm{ASH}}_3>{\mathrm{SbH}}_3$
B) Q,R,S,T → Order of M.P and stability and lewis basic character decreases in the order KF > KCl > KBr > KI
C) Order of thermal stability decreases in the order ${\mathrm{H}}_2\mathrm{O}>{\mathrm{H}}_2\mathrm{S}>{\mathrm{H}}_2\mathrm{SO}>{\mathrm{H}}_2\mathrm{Te}$
D) P,Q → order of reduction power is ${\mathrm{CH}}_4<{\mathrm{SiH}}_4<{\mathrm{GeH}}_4<{\mathrm{SnH}}_4$