Elimination Reactions To Produce Alkenes

Question 1

Conditions for the reactions to produce an alkene from a halogenoalkane

Answer 1

Reacting a halogenoalkane with a warm alkali dissolved in ethanol under reflux to get an alkene. This causes the OH- ion to act as a base and not a nucleophile.

Question 2

Equation for the reaction to produce an alkene from a halogenoalkane

Answer 2

RX + KOH —> R(=)R + H2O + KX

Question 3

Conditions for making alkenes from alcohols

Answer 3

The alcohol is mixed with an acid catalyst, can be phosphoric acid (H3PO4) and then heated to eliminate water.
The hydroxide group and hydrogen which comes from the adjacent carbon to the hydroxide group form the water.

Question 4

Equation for making alkenes from alcohols

Answer 4

ROH —> R=R + H2O