Yes you can
Yes, you can . They must be mounted as a pair.
yes
Yes you can
yes
Can you? Yes. Should you? No. The 235 will be 3.67% smaller. This will adversely effect your ride, handling, speedometer, and braking.
yes they will
Maybe, if there is clearance for the wider tire.
That size will work but your speedometer will be off .8 mph too fast.
Yes, you can
Yes, they can
You cannot directly replace 235/75 R15 tires with 265/75 R16 tires due to differences in both width, aspect ratio, and wheel diameter. The 235/75 R15 tires are designed for a 15-inch rim, while the 265/75 R16 tires fit a 16-inch rim. Additionally, the overall diameter and width of the tires will differ, which can affect vehicle handling, speedometer accuracy, and clearance. Always consult your vehicle's specifications or a tire professional before making such changes.