1. Which compound could be a product of this reaction?

2. Acid-catalyzed addition of water accompanied by rearrangement. Which compound could be a product of this reaction?

4. HBr adds twice to alkynes forming a geminal dibromide. Note use of ether solvent and absence of water (until workup). Which compound could be a product of this reaction?

6. Addition of dihalogens to alkenes proceeds by an anti mechanism. Which compound could be a product of this reaction?

8. Hindered, strong base = Hofmann elimination. Which compound could be a product of this reaction?