Consider a network of resistances each of value of $R$ as shown in figure

Column - I	Column – II
Equivalent of network between A and C is	p) same
Equivalent resistance between A and B	q) 5/8R
Potentials of B and D when voltage source is applied across A and C is	r) R
Equivalent resistance between B and D is	s)R/2

Across AC , it is a wheatstone bridge , hence net resistance = R 

Across AB ,{ [(Q and Y are in series ) which is parallel to Z ]which is in series with X } which is in series with P : hence net resistance = 5R/8

Potentials of B and D are same when source is connected across AC , since wheatstone bridge condition is satisfied . 

Across BD , [(P and X in series ),(Q and Y in series ) ]parallel to Z , hence net resistance = R/2