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Question about SN1 and SN2 reactions. In my lab we prepared 1-bromobutane from 1-butanol (SN2) and...

Question about SN1 and SN2 reactions. In my lab we prepared 1-bromobutane from 1-butanol (SN2) and 2-chloro-2-methylbutane from 2-methyl-2-butanol (SN1). I don't undetstand the following questions:

1. Why did we heat the SN2 reaction but not the SN1 reaction?

2. What was the purpose of performing a simple distillation on both reactions? What were you isolating your products from?

3. What was the purpose of washing both of oyur reaction mixtures with brine (saturated sodium chloride)?

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