Question

Grignard Lab

9. (2 pts.) What is the purpose of adding the petroleum

ether?10. (2 pts.) The entire reaction sequence is given below, there are TWO steps that involve reaction betweentwo reagents/reactants/ The first is the reaction between the bromobenzene with the magnesium. What isthe limiting reagent/reactant for reaction between the bromobenzene with the magnesium?11. (2 pts.) The second is reaction of the Grignard with benzophenone. What is the limiting reagent/reactantfor reaction between the Grignard and benzophenone (you have to assume that the Grignard is formed in100% yield since the Grignard reagent can’t be isolated for you to weigh it)?12. (2 pts.) Based on your answers to questions 10 and 11, what is the limiting reagent/reactant forformation of the triphenylmethanol?13. (2 pts.) What are possible reasons for the yield of formation of the Grignard reaction being less than100%?14. (2 pts.) What are possible reasons for the yield of formation of the triphenylmethanol reaction being lessthan 100%?15. (2 pts.) The reaction is performed in ether as the solvent, which is a reasonably polar aprotic solvent.Another polar aprotic solvent that you might have considered using is acetone. However, that would notwork because the Grignard would react with the solvent instead of the benzophenone. Give the product ofthat reaction (after acid hydrolysis workup)?

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