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AQA AS-Level Chem2...Quick question(?)

Hey guys,
I was just wondering whether we have to Know the mechanism for the dehydration of alcohols??
Do we just have to know that an OH group is removed, alongside a Hydrogen atom, which is attached to the Carbon atom adjacent to the Carbon attached to the OH group?
Is that it, or like do we have to know the actual mechanism for this?!
Many thanks!

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