Isoprene
 

Isoprene (2-methyl-1,3-butadiene) reacts with the following:
(1) hydrogen chloride (1 mole equivalent) in ether
(2) deuterium chloride (1mole equivalent) in ether
(3) bromine (1 mole equivalent) in carbon tetrachloride
(4) excess hydrogen gas in the presence of a PtO2 catalyst
(5) excess mercury (II) acetate and methanol followed by sodium borohydride
(6) excess ozone followed by zinc and acetic acid
How should the structures of the obtained products from each of the reagents be drawn?

(1) Look up 'electrophilic addition to alkenes' in your o-chem book.
(2) Same as (1).

Actually quite a few of these look like additions to alkenes. Read that section again and you should get most of the answers. After you've done that, post the ones you are still stuck on.