no you can not
No, you cannot end a game of Uno with a Draw 4 card.
No, you cannot stack a Draw 4 on a Draw 2 in Uno.
No, you cannot put a Draw 4 card on top of a Draw 2 card in Uno.
No, you cannot put a Draw 2 card on top of a Draw 4 card in Uno.
No, you cannot put a Draw 4 card on top of a Draw 2 card in Uno.
No, you cannot stack a Draw 2 card on top of a Draw 4 card in Uno.
No, you cannot stack a Draw 4 card on top of a Draw 2 card in Uno.
No, you cannot put a reverse on a Draw 2 card in Uno.
No, a wild card cannot stop a Draw 2 in a game of Uno.
No, you cannot put a wild card on a Draw 2 in the game of Uno.
No, in Uno you cannot skip a player and draw 2 cards in the same turn.
No, you cannot stack a Draw 4 card on top of a Draw 2 card in the game of Uno.