Cannot touch cloned prefabs

I want to make a touch destroy game, so every time i destroy a random spawned object the score rises I have 1 object prefab, it has BoxCollider(for raycasting) and 2 Scripts (TouchDestroy and AutoDestroy)

Unfortunately when i test it on Android Device, the touch input has no effect at all.

this is my TouchDestroy script

 #pragma strict

 var ray : Ray;
 var hit : RaycastHit;
 if(Input.GetMouseButtonDown(0))
         {
             Debug.Log("left click");
             ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             if(Physics.Raycast(ray,hit))
             {
                 if(hit.transform.tag =="Player")
                 {
                     Score.score+=100;
                     Destroy(hit.collider.gameObject);
                 }
             }
         }

i have tried this alternative touch destroy but still did not work

 if (Input.touchCount > 0) 
     {
         Debug.Log("touched");
         var dtouch : Touch = Input.GetTouch(0);
         ray = Camera.main.ScreenPointToRay(dtouch.position);
         if(Physics.Raycast(ray,hit))
             {
                 Debug.Log("Raycasted");
                 if(Input.touchCount == 1)
                 {    
                     Debug.Log("one touch");
                     if(dtouch.phase == TouchPhase.Began)
                        {
                          Score.score+=100;
                         Destroy(hit.collider.gameObject);
                     }
                 }
             }
     } 

anybody can help me solve this?