Dear Sir,
You can't show 1crore in cash because one is not allowed to accept any payment exceeding 20000 in cash with respect to the sale of immovable property.
If you do so, penalty equivalent to the amount received in cash( I.e. one crore in this case) can be imposed.
Please feel free to call/revert in case of any doubts
Thanks and Regards
Abhishek Dugar
CA CS B.Com