Question

answer B & C asap please

4. Consider the following reaction and answer the questions: - Br HSCH, SCHE нс" HC HEC a) Draw the structure of the expected cation intermediate if the reactant underwent an SNl reaction b) The reaction produces almost an equal mixture of diastereomer products, does this indicate an Snl or Sn2 mechanism, explain your choice briefly? c) Even though a good nucleophile is present, explain in terms of reaction rates, why a mixture of products is observed.

Answer 1

Step CNN (Carbocation) 1 Formation of carbocoton is slow step i.e. rate determining step. When equal molar of mixture of diastereomers are hormed this indicate an SN reaction mechanism. In SN mechanism equal mixtures 1 a d fd isomer is obtained ie racemization takes place

Reachon - ОСИ, Busch 1 Slow stepp 1 Tito 3 fast step-lich Carbocation „Scи, Here step-I is slow step & attack of nucleophle is fast step. Rate of reaction is depends on the slowest step. So even though a good Inucleophile is present that will not affect rate of reaction became formation of carbocation is slow & rate determining step.