Question

How do alcohols react?

Answer 1

You can't hope to get a comprehensive answer here.

Explanation:

Organic reactivity is usually separated into two classes: bond making; and bond-breaking. Certainly this is observed in `S_N1` versus `S_N2` reactions. Anyway, there is nothing I write that you won't learn better from your organic chemistry text. Look up the chapter on alcohols, which will detail the factors important in dehydration reactions.