"Hydrohalogenation is the addition of hydrogen halides HX (X = Cl, Br, and I) to alkenes to form alkyl halides. Two bonds are broken in this reaction—the weak π bond of the alkene and the HX bond—bond two new σ bonds are formed—one to H and one to X. Because X is more electronegative than H, the H – X bond is polarized, with a partial positive charge on H. Because the electrophilic (H) end of HX is attracted to the electron-rich double bond, these reactions are called electrophilic additions."
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Janice G. Smith, Organic Chemistry, 3rd ed. (2011), Ch. 10 : Alkenes.
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Halogenation
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