Assign the stereochemistry to 1-bromo, 4-chlorocyclohexane

Question

Please help to assign the priority stereochemistry of 1-bromo, 4-chlorocyclohexane and please explain how is it be done. Thank you 

Answer 1

1-bromo, 4-chlorocyclohexane has no asymmetric centers therefore it only has Cis/Trans isomers. You could draw a chair conformation. The bulky Br atom would be at an equatorial position at C-1 in both structures. The Cl atom will occupy the bonds at C-4 and toggle between axial (Cis) and equatorial (Trans).