What happens when:
(i) Ethyl alcohol is heated in the presence of Al2O3 at 493 K?
(ii) Ethylene dibromide is heated with zinc dust?
(i) Ethylene is formed.
(ii) Ethylene is formed by dehalogenation reaction.
What happens when butan-2-ol is heated with concentrated H2SO4. Account for the product formed.
What is Saytzeff’s rule? Explain it with an example.
Out of the two - trans-but-2-ene and cis-but-1-ene, which is more stable and why
Trans-but-2-ene has less heat of hydrogenation than the cis-isomer, therefore it is more stable. 
In the trans isomer, the two methyl groups are present on the opposite side as compared to cis-isomer. As a result, the Vander Waal's forces of attraction in trans isomer are less. This means that the trans isomer has less heat of hydrogenation and is more stable than the cis-isomer.
What happens when 2-Bromobutane is heated with alcoholic KOH. Account for the product formed.
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