Could I write a review paper as my B.Tech (Bachelors in Technology) final year project, rather than presenting an experiment based work?
You should check the official site of your university and see if you get the solution for your question otherwise you can ask your mentor or guide for research and they will help you for sure. 
It is probably possible that they will allow you to write a review paper, rather than doing a final year project because the system is totally based on credits and credits are nothing but the amount of hours you put in to get a credit and writing a review paper is a difficult job and needs lots of hours to do , so I think they will allow you to that.