How does adding a small amount of a grignard reagent, Ask an Expert

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How does adding a small amount of a Grignard reagent solution to a Grignard reaction help the reaction get started? Hint: The presence of water (moisture) is a major reason a Grignard might not start. Write the reaction that would lead to formation of propane from the Grignard reagent formed from 2-bromopropane.

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