destroy an instantiated object from oncollision enter

destroy an instantiated object from oncollision enter of an object in the oncollision enter of another object

here's my script

     if(theCollision.gameObject.name == "explosive")
      {
           boom= Instantiate(fire, transform.position, transform.rotation);
           boom.transform.parent = transform;
           boom.rigidbody.position.x += Random.Range(0.0f, 0.3f);
           boom.rigidbody.position.y += Random.Range(0.0f, 0.3f);
      }
 
  else if(theCollision.gameObject.name == "mutant")
      {
         Destroy(boom, 1);
      }