We have that the logical retrosynthesis of the given target molecule leads to PhMgBr as the Grignard reagent
From the question we are told
A logical retrosynthesis of the given target molecule leads to which grignard reagent?.
Chemical reaction
Generally the equation for the Chemical reaction is is mathematically given as
Ph-OH =>PhMgBr+H=O
Henec the Forward reaction
H=O+PhMgBr (dry ,ether)---> Ph-OMgBr --> Ph-OH
Therefore
PhMgBr is the Grignard reagent
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