Playing a different sprite prefab on collission.

Hello,

I have a sprite animation for a flying UFO and another sprite animation for an explosion. Right now I have the following script attached to the flying UFO sprite prefab:

 using UnityEngine;
 using System.Collections;
 
 public class GroundCollide : MonoBehaviour {
 
     public AudioClip _crash;
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 
     void OnCollisionEnter2D(Collision2D collision) 
     {
         StartCoroutine(waitFunction());
         audio.loop = false;
         audio.clip = _crash;
         audio.Play();
         Destroy(this.gameObject,_crash.length);
         //print( "BOOM" );
     }
 
     
     IEnumerator waitFunction()
     {
         float timeToWait = 5;
         yield return new WaitForSeconds(timeToWait); 
     }
 }

My question is, how do I get the explosion sprite prefab to play inside the OnCollisionEnter2D before my main UFO sprite prefab is destroyed?

Thanks.