Bomb.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Bomb : MonoBehaviour {

    public GameObject explosionPrefab;

    private void OnTriggerEnter2D(Collider2D collision)
    {
        Destroy(collision.gameObject);
        GameObject.Instantiate(explosionPrefab, transform.position, transform.rotation);
        Destroy(gameObject);
    }
}