Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces

The involved reaction is

We can see that the H and Br are same side, Hence elimination is difficult. Trnas-2-phenyl-1-Bromo cyclo pentane

Structure is as follows :

halo alloane treatment with dlcoholic KOH results in E2​ anti-elimination mechanism 
 

Anti elimination means H and Br both departing groups must be present at dihedral angle 1800 (anti).