Grignard reagent

C6H5MgBr + CO2(s) --> C6H5COO?MgBr

C6H5COO?MgBr+ + H3O+ --> C6H5COOH + H2O + Mg2+ + Br?

a.Suggest an alternate synthesis that can be used to make benzoic acid from readily available starting materials.

b. In the synthesis of benzoic acid, benzene isoften detected as an impurity. How does this come about? he primary impurity in the present experiment isbiphenyl. Show how it is produced.

c. Why is it absolutely necessaryto defrost the dry ice at the beginning of step2? What would happenif you don’t?

d. Just after the dry ice has evaporated fromthe beaker, what is the white solid remaining? Write a chemical equation for the reaction of the white solid with 3M HCl.