Play after collision a Particle-prefab and spawn a new Coin-Prefab

Questions & Answers
1

Hey guys.

I have now created a particle effect and ad it to a prefab. When I start the game the particle effect plays immediately without any collision.
What I’m doing wrong here?
EDIT: I have solved the first problem.

If the collider is destroyed, how I can spawn a new coin-prefab on the same position?

As last, how can I destroy a collider separately? Currently if I’m jumping between the 2 colliders both will destroyed. I would like it that only once per jump destroyed a collider.

I hope you can help me.

Here is the script(on the line 20 for particle effect):

using UnityEngine;
using System.Collections;

public class BlockBreakable : MonoBehaviour {

	public float breakableTime = 0.5f;						
	AudioClip soundBumpBreak;								
	public string tag = "Player";
	public PlayerControllerScript controller;
	public Transform particleprefab;
	public GameObject coinprefab;

	
	void OnCollisionEnter2D(Collision2D coll)
	{
		if(coll.gameObject.tag == tag && !controller.grounded)
		{
			BreakableWait ();
			Destroy (this.gameObject, breakableTime);		
			Instantiate(particleprefab, new Vector3(0, 0, 0), Quaternion.identity);
		}
	}
	
	IEnumerator BreakableWait ()							
	{
		yield return new WaitForSeconds(breakableTime);		
	}
	void Start ()											
	{
		audio.clip = soundBumpBreak;						
		audio.Play ();										
	}
}
2

Use transform.position:

void OnCollisionEnter2D(Collision2D coll)
    {
       if(coll.gameObject.tag == tag && !controller.grounded)
       {
         BreakableWait ();
         Instantiate(particleprefab, transform.position, Quaternion.identity);
         Instantiate(coinprefab, transform.position, Quaternion.identity);
         Destroy (gameObject, breakableTime);       
       }
    }