Answer to Question 3

There will be a turning moment to the left as the right wing is much lighter than the left.  The pilot would have to steer to the right to raise the left wing.

At best this will make the aeroplane much more difficult to handle.  As the pilot slowed down to land, there is a strong chance that the left aileron (a flap which steers the plane) would become less effective, so the wing dropped right down, causing an uncontrollable spin.

Unfortunately he cannot pull over behind a cloud and transfer the fuel using a petrol can and funnel...

Not the best situation to find oneself in.