Identify all the possible alkenes that would be formed on the dehydrohalogenation of the following organic halides with alcoholic `KOH`. Also, identify the major alkene.
a. 1- Chloropentane
b. 2- Chloropentane
c. 2-chloro-2-methyl butane
d. 2-Chloro-3-methyl butane
e. 3- Chloro-2-methyl pentane
