Capital gain on residential & commercial property

I have multiple queries

1-I have multiple flats is my name.
I want to Gift one of my flat to my wife & sell in few months.
If she sells that, can she can invest those proceeds in other resdential property to avail capital gains tax exemption.
I hope no clubbing provisions exist here

2-If i sell flat myself can i invest in capital gains bond to avail exemption as i already hold multiple properties

3-If i sell a commercial property can i invest in capital gains bond to avail exemption. I already have 2 residential property so i cannot invest in new residential property to avail exemption

Please suggest if any other better options.