I think this is something that may vary accross theses.
I mentioned my main objectives and hypotheses in the introduction, and then linked back to each of these in the general discussion saying how each of these was addressed and whether the hypothesis was supported.
My PhD consisted of one large overall project that could be broken down into three areas and these could be correlated with each other. I therefore had four experiemntal chapters, each of which had an introduction, methods, results, discussion format. I therefore had objectives and hypotheses that fitted with each of these and so included these in the chapter introduction and related back to them in the chapter discussion.
Hope that makes sense.