Are two 1031 exchanges allowed in the same year?

[Fabiola Noel]

Good morning, 

I appreciate your answers. Thank you so much

1) Is it allowed to have two 1031 exchanges from the sale of 2 rentals in the same year? 

2) Also, is it allowed for proceeds of both sales to be used as down payment towards 1 single asset?

3) can a 250k exemption from sale of primary residence be claimed in the same year as a 1031 exchange for a rental?