For your benefit, and the benefit of new chemistry students who browse this posting, can you list the reaction types your book mentions, and an example of each? This exercise may give you the "a-ha" moment you need, and will be helpful in later questions you may have. Also, it will put us all on the same page. For example, in my day, we were taught single-displacement reactions, and double-displacement reactions, while you call the latter ones -- metathesis reactions. Try to pull all your posts together.