Out of `C_(6)H_(5)CH_(2)Cl` and `C_(6)H_(5)CHClC_(6)H_(5)`, which is more easily hydrolysed by aqueous KOH.

Explanation

Hydrolysis follow `S_(N)1` path. The `S_(N)1` reaction procceds through the formation of more stable intermediate product carbocation. Thus, greater is the stability of carbocation, faster will be the reaction rate.
The intermediate product formed during the reaction of given two compounds are :

The `2^(@)` carbocation is more stabilized the + R effect of two phenyl groups. Thus, `C_(6)H_(5)underset("Cl ")underset("| ")("C ")H-C_(6)H_(5)` will readily undergo hydrolysis.