I need the answer as soon as possible

b) For the following reaction sequence: step 1 step 2 SiEt2Cl2 . B 2 Na[Mezind] a) 2 Buli b) ZrCl4 step 5 step 4 step 3 E + polymer D C excess H2 excess 1-butene excess MAO [MezInd] = MAO = Methylaluminoxane a) Draw the structures of compounds and intermediates A-E b) Draw and name the tacticity of the polymer product c) Draw and explain 2 modifications in the catalyst ligand structure that would permit a change in the polymer stereochemistry