When HBr is added to a simple alkene in the presence of an ether solvent containing peroxides, the regiochemistry obtained is the reverse of that obtained in a polar solvent.a) When we say that a solvent is polar what do we mean?b) State what determines the stability of an alkene?c) From your knowledge of radical addition mechanism, what product would you expect from the treatment of 1,3-butadiene with HBr in peroxide containing ether. Support your answer by showing the mechanism for the reaction and the role played by the peroxide2) Explain why retrosynthetic analysis is so important to synthetic organic chemists.3) Explain, using an example, what is meant by a vicinal halohydrin