Column-I		Column-II
A)	Graphite	P)	Layered structure
B)	Boric acid	Q)	Delocalization of electrons
C)	Borazole	R)	Electrical conductor
D)	Boron nitride	S)	Hydrogen bonds

	A	B	C	D
1)	PQR	PS	Q	PQ
2)	PR	Q	S	P
3)	PQ	R	Q	S
4)	PS	P	Q	R

A) Graphite
$\to$layered structure, delocalization of electron, electrical conductor 
B) Boric$\to$acid
layered structure, hydrogen bonds 
C) Borazole$\to$Delocalization of electrons 
D) Boron nitride$\to$ layered structure, delocalization of electron