Chemistry lab; the synthesis of Triphenylmethanol

In the synthesis of Triphenylmethanol, we added two molar equivalent of Grignard reagent prior to the addition of methyl benzoate. What is the purpose of 2 molar equivalent??? What will happen if we use only one molaWhat that will happen if we use only one molar equivalent of the Grignard reagent with methyl benzoate??

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