A few islamic history questions I'm puzzled by. Need some help brothers/sisters.

[archenix]

What was the last COMPLETE surah revealed to the prophet?
Who was the first woman punished for stealing in islam?
Who was the last companion buried at Al Baqi cemetery?
There was a battle where the prophet came late and a companion was leading salat, and the prophet followed him. Who was the companion?

 

[ardianto]

There was a battle where the prophet came late and a companion was leading salat, and the prophet followed him. Who was the companion?

Abdurahman ibn Auf (ra). In the battle of Tabuk.