How to route requests to specific instances in amazon?

I am having cname(abc.com) pointed to my elastic IP and need to create three EC2 instances(e.g. Instance1, Instance2, Instance3) for three different applications.

Now I want to achieve following results: If user hits "abc.com/App1", request should be redirected to Instance1.If user hits "abc.com/App2", request should be redirected to Instance2.If user hits "abc.com/App3", request should be redirected to Instance3.

All these Instances should work independently. And, If any of these goes down, it should not impact others. We can't use subdomains. I am trying to find out something in ELB.