Angular: Bind observable and evalute results

Question

I want to have structure like

MyStruc {
   action2Execute:any; // see #q3

   constructor(coll: CollectionServices) {
    // see #q1
   }
}

and have a ServiceClass like

MyServiceClass {
  constructor(public http: HttpClient) { }

  myHTTPRequest(id:number):Observable<boolean>{
     this.http.get<boolean>('call/my/webservice/'+id)
  }
}

and a Controller class like

MyControllerClass {

  constructor(private coll: CollectionServices) {}
  ...
  execHTTP() {
     new MyStruc(coll).action2Execute.apply(1);
  }

}

Now my purpose is to bind action2Exectue to the method myHTTPRequest, call it and process the results. I have two problems with this

1. If I set action2Execute like this.action2Execute=coll.myHTTPRequest than I have the problem when I call it in MyControllerClass.#execHTTP() I get an error which says: TypeError: Cannot read property 'get' of undefined ==> http is undefined

2. My other problem is that by just using apply I do not get the results from the observable, i.e. from the HTTP request.

3. What type should have action2Exectue in the class MyStruc?