Question 11.9: Write an equation showing all the products of the hydrohalog...

Begin by drawing the structure of 1-pentene and of hydrochloric acid.
Markovnikov’s rule tells us that the carbon atom that is already bonded to the greater number of hydrogen atoms is more likely to receive the hydrogen atom of the hydrochloric acid molecule. The other carbon atom is more likely to become bonded to the chlorine atom. Thus, we can complete the equation by writing the major and minor products.
As predicted by Markovnikov’s rule, the major product is 2-chloropentane and the minor product is 1-chloropentane.