How to destory gameObject without destroying the audio source attached to it?

How can I destroy a GameObject without destroying the sound effect attached to it? I tried a coroutine to wait 3 seconds before the object is destroyed so the sound can finish playing but it didn’t work.

public class DestroyByBoundary : MonoBehaviour {

	IEnumerator WaitToDestroy(Collider2D other) {
		yield return new WaitForSeconds(3);
		Destroy (other.gameObject);

	IEnumerator OnTriggerEnter2D(Collider2D other)
		if (other.tag == "platforms") {
				yield return WaitToDestroy(other);
			//Destroy (other.gameObject);

The only way I can think of is to have the audio source on a child object. Then un-parent it just before you destroy it. You can then set this now separate audio source object to destroy itself once the audio has finished playing.

Or you can disable all aspects of the object, colliders, rigidbodys, and renderers, then wait until the audio has finished playing and destroy it then.

while (audio.isPlaying) {

//Then Destroy.

As a workaround, why not disable all relevant components, but leave the AudioSource? So you would disable all scripts and the MeshRenderer, and keep only the AS active.