Can you? Yes. Should you? No. The 235 will be 3.67% smaller. This will adversely effect your ride, handling, speedometer, and braking.
Yes you can
Yes, you can
yes
No, this is a very bad swap. Your speedometer will read 57.8 at a true 60 mph. This swap will adversely effect handling, ride, and performance.
235/75r/16 255/70r/16
235/65-16 or 255/60-16 are acceptable swaps.
Yes you can
That should be OK, but check carefully for any rubbing.
No, the 255/70-16 is too large and the diameter will be 1.10" too tall and your speedometer will be 2.2 mph too slow. You are going over 3% difference in size which is never advisable. You can use a 245/70 or a 245/60 but not a 255/70. Make sure all 4 tires are the same size on a 4wd vehicle.
Maybe, if there is clearance for the wider tire.
That size will work but your speedometer will be off .8 mph too fast.
That should be OK, but check carefully for any rubbing.