Alkenes and alkynes(l) 9.1 Introduction Additions to alkenes Addition C-C t A-B Ac—c—B We shall study other examples of additions to the double bonds of alkenes. We begin with the additions of hydrogen halides, sulfuric acid water(in the presence of an acid catalyst), and halogensAlkenes and alkynes (II) 9.1 Introduction: Additions to alkenes We shall study other examples of additions to the double bonds of alkenes. We begin with the additions of hydrogen halides, sulfuric acid, water (in the presence of an acid catalyst), and halogens. C C + A-B A C C B Addition