Hi,
1) Investing the Sale Proceeds from the selling of residential house , in land does not exempt your capital gain, if any.
2) From FY 2017-18, Period of holding for Long Term capital gain is reduced from 36 months to 24 months. but prior to that period of holding of capital asset should be 36 months to claim long term capital gain.
3) No cash transaction is allowed in sale of an capital asset.
4) Yes , you would received. but you have to calculate Capital gain/loss on the value of Rs 29.5 lakhs only. and go for registration of sale deed after you received the maximum amount.
5) Payment modes can be cheque, demand draft, online transactions, it is better to mention cheque no or transaction number in the sale deeds.
6) you need to mention sale transaction details i ITR (loss or gain) under capital gains.
if you invest the capital gain amount under section 54, then no additional income will be added in your income.
7) mainly time frame for investment is 6 months of the transaction date.
i am sending the investment details in my next answer.