Out of C₆H₅CH₂Cl and C₆H₅CHCIC₆H₅ which is more easily hydrolysed by aqueous KOH. 

Hydrolysis by aqueous KOH proceed through the formation of carbocation. If carbocation is stable, then the compound is easily hydrolyzed by aqueous KOH. In the given compounds benzyl chloride forms  primary carbocation, while chlorodiphenylmethane forms secondary carbocation, which is more stable than primary carbocation, hence C₆H₅CHClC₆H₅ is more easily hydrolysed by aqueous KOH.