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Get your questions answered here: http://kuadro.com.br/videoaula/quimic... Watch other chemistry video lessons: http://kuadro.com.br/quimica What is halogenation? And hydrogenation? In this video lesson we show the processes of halogenation and hydrogenation in Alkynes. Both processes occur in two phases, and in the first phase an unsaturation is maintained in the reactant organic molecule. Want to pass the entrance exam? Study with Kuadro.