Mid Summer Nights Dream by Shakespeare

What is Oberons reaction to Titania once shes fallen in love with Bottom? How do his emotions about her change, and which lines indicate this?

2: How does Oberon win the power struggle between him and Titania?

3: What is Bottoms reaction to his dream, and what does he decide should be done about it? Is this an indication that his character has returned to normal? How so?

4: What purpose does Act IV, Scene II, serve in the play? What information or expanded knowledge are we given?