1. No, you cant deduct the same.
2. You can use it whatever way you want if you are ready to pay taxes. If you want to get an exemption, then you will have to buy a new house or construct a new house.
3. You can buy REC/NHAI bonds.
Please feel free to call/ revert in case you need more clarity.
Thanks and regards
Abhishek Dugar
CA CS B.Com