Match the planes in Group 1 with the interplaner spacings in Group 2 for a cubic crystal having a lattice parameter of 'α'.

Group 1	Group 2
P. (100)	1. $$\frac{\alpha }{{\surd 5}}$$
Q. (110)	2. $$\frac{\alpha }{{\surd 3}}$$
R. (111)	3. $$\frac{\alpha }{{\surd 2}}$$
S. (210)	4. α
	5. $$\frac{\alpha }{2}$$
	6. $$\frac{\alpha }{3}$$