(i) Draw the structure of styrene. (ii) Markovnikov's rule. Outline the mechanism when styrene reacts with HCl, following

The reaction of p-cresol with CH2=O resembles the reaction of phenol (PhOH) with CH2=O, except that the resulting polymer is thermoplastic but not thermosetting. Draw the structure of the polymer formed, and explain why the properties of these two polymers are so different.

An unknown hydrocarbon A with the formula C6H12 reacts with 1 molar equivalent of H2 over a palladium catalyst to give hydrocarbon B. Hydrocarbon A also reacts with OsO4 to give the glycol C. When oxidized with KMnO4 in acidic solution, A gives two fragments. One fragment is propanoic acid, CH3CH2COOH, and the other fragment is ketone D (R2C=O). What are the structures of A, B, C and D? Write all reactions.

Must stereochemistry be considered when synthesizing ethylene glycol from ethene? Explain.