BULLET DOES NOT EXPLODE WHEN HIT THE ENEMY

// Instantiates a projectile every 0.1 seconds, // if the Fire1 button is pressed or held down. var projectile : Rigidbody; var fireRate = 0.1;

var Velocity : float = 25;

private var nextFire = 0.0;

function Update () {

 //If the player holds down or presses the left mouse button
 if (Input.GetButton ("Fire1") && Time.time > nextFire) {
     Shoot();
 }
 

}

//To make our scripting a little more Object-Oriented-Programming, we will create our custom functions as well function Shoot() {

 //Add fireRate and current time to nextFire
 nextFire = Time.time + fireRate;
 
 //Instantiate the projectile
 clone = Instantiate (projectile, transform.position, transform.rotation);
     
 //Name the clone "Shot" ::: this name will appear in the Hierarchy View when you Instantiate the object
 clone.name = "Shot";
 
 //Add speed to the target
 clone.rigidbody.velocity = transform.TransformDirection (Vector3.forward * Velocity);
 

}

when i shot the enemy bullet does not explode, ı want to see an effect while exploding. if all my script has any problem, could you tell me all steps one by one