Give the structure, exclusive of stereochemistry, of the principal organic product formed on reaction of 2,3-dimethyl-1,3-butadiene with each of the following:
(a) 2 mol H2, platinum catalyst
(b) 1 mol HCl (product of direct addition)
(c) 1 mol HCl (product of conjugate addition)
(d) 1 mol Br2 (product of direct addition)
(e) 1 mol Br2 (product of conjugate addition)
(f) 2 mol Br2
(g)