Bromoalkanes may react with alcoholic potassium hydroxide solution to form alkenes. Basing on this statement answer the following questions:

i) What type of organic reaction is this reaction?
ii) Write an equation for the reaction of 1-bromobutane with alcoholic potassium hydroxide. Show all mechanisms involved
iii) Draw the structural formula of the alkene obtained by reaction between 2-bromobutane and alcoholic potassium hydroxide