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An unavoidable side reaction of alkyl halides with active metals which lowers the yield of Grignard reagents is called coupling.
2 RX + Mg --------> R-R + MgX2
Although the mechanism of the coupling process is not well understood, it is known that ratre appears to depend on the square of the concentration of the halide. With this in mind, explain the reason for the sequaence of addition of the ether solution employed at the beginning of the formation of the Grignard reagent in the experimental procedure above.
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What did the student do wrong? If the solution had been prepared correctly to the desired 1.0 M concentration, what volume of this stock should be diluted to prepare 100.0 mL of a 1.0 mM working solution?
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