Socket io for large scale chat applications

We are planning to build a large scale chat applications using socket io ans express js, current structure

1. Mongodb for database with redis.

2.For private chat implementation use socket.io rooms for each user pair.

3.group chats upto 2000 members in a group.

So my question is socket.io rooms is enough for the private chat and group chat??

via Blessan Kurien