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How to work out the reaction mechanism (SN2/E2) from the rate equation?

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    Name:  reaction mechanism question.jpg
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Size:  177.2 KBIf all you're given is a table like this

    How would you suggest a possible reaction mechanism for this?

    I worked out that it's first order with respect to each reactant, so second order overall.

    So this would mean it's either an SN2 reaction or an E2 reaction because the rate is affected by 2 different things (leaving group and nucleophile), but how do you decide on which one it is if you're not given any other info? Is there a way to tell just from the orders?

    I'd think it was SN2 or E2 based on those kinetics. Could maybe be a radical mechanism too.

    I don't there's a way of knowing which just based on what you have been given.
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