In the dehydrohalogenation of alkyl halides, if there is a possibility of formation of more than one alkene due to the availability of more than one $\beta$-hydrogen atom, the major product is usually the more highly substituted alkene. This is in accordance with Saytzeff's rule (also known as Zaitsev's rule), which states that the preferred product is the alkene which has the greater number of alkyl groups attached to the doubly bonded carbon atoms . Consequently, the dehydrohalogenation of 2-bromopentane yields pent-2-ene as the major product (81%) and pent-1-ene as the minor product (19%) .