So basically apply Zaitsev’s rule  only to dehydration reactions? (No. To any elimination. - GS). Also, would the Markovnik rule be used to identify which carbon a halogen should be attached to? In specific does it mean that a halogen attaches to the carbon with the least hydrogens? (Correct. This rule applies to addition. Compare with Zaitsev’s rule. “Zaitsev” is a derivative from the Russian word for “Jack rabbit” or "Hare", which can run away or eliminate. “Markovnikov” is a derivative from the Russian word for “Carrot”, which adds good nutrients. Just a way to remember to which reactions those two rules apply. - GS). That’s a very helpful/interesting way to remember which is which. Thanks. :)