Chemguide: Support for CIE A level Chemistry
Learning outcome 15: Halogen compounds
This statement is about the various types of halogenoalkanes - primary, secondary and tertiary.
You will find this near the beginning of the page Introducing halogenoalkanes. It wouldn't hurt to read the rest of the page as well, particularly the last section on the reactivity of halogenoalkanes, although we will need to come back to that later.
© Jim Clark 2020