Can you explain the synthesis and reaction of a Grignard Reagent?

Question

Can you draw and explain the equation as well? I know I have the wrong one because my professor said it was wrong. 

 He said write the  reaction equations for the synthesis of benzhydrol starting with bromobenzene, magnesium, and benzaldehyde using ether as the solvent.

Answer 1

C6H5Br  +  Mg  ----------> C6H5MgBr

C6H5CHO  +  C6H5MgBr ---------------> (C6H5)2CH-OMgBr

(C6H5)2CH-OMgBr  +  H2O  -------------> (C6H5)2CHOH + Mg2+