The relative susceptibilty of a hydrogen atom to chlorinatio

The relative susceptibilty of a hydrogen atom to chlorination is dependent on the degree of substitution at the carbon to which it was bound. Both the 1,2- and 1,3-dichlorobutane products involve 2 °-structures. Account for the differencees between the two found in this exercise. Thanks!

Solution

You see an inductive effect in 1,2-dichlorobutane