Capital Gain Tax from Multiple property

I have following doubts on LTCG tax. 1. If I have 3 residential properties. Can I sale 2 properties  to buy 1 residential property and save tax under section 54. 2. What if the LTCG gain from sale of 2 properties exceed 2cr. 3. Can I sale one property in this fin. year and pay capital gain tax or save under 54EC and sale 2nd property in next fin. year and invest in another property and save tax under sec.54. 4. can I invest in 54EC 2 times in 2 financial years. Can the total investment under 54EC in twof inancial  years exceed Rs.50 lakhs.

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