Destroying 2D clones on touch

Question not clear.

What may touch them ? Finger of the user (on mobile) ? Other object ?

Give details please, and the code you've tried so far

The finger.

using UnityEngine; using System.Collections;

public class touch : $$anonymous$$onoBehaviour {

 void Update()
 {
     for (int i = 0; i < Input.touchCount; ++i) {
         if (Input.GetTouch(i).phase == TouchPhase.Began) {
             RaycastHit2D hitInfo = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.GetTouch(i).position), Vector2.zero);
             // RaycastHit2D can be either true or null, but has an implicit conversion to bool, so we can use it like this
             if(hitInfo)
             {
                 Destroy(gameObject);
                 // Here you can check hitInfo to see which collider has been hit, and act appropriately.
             }
         }
     }
     if (Input.Get$$anonymous$$ouseButtonDown (0)) {
         Destroy(gameObject);
     }
 }

}