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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 How does the free radical substitution reaction occur? In this video lesson, Kuadro shows the mechanism of substitution reactions in alkanes. The reactions that are slow occur because of the formation of free radicals in the first stage. Studying with Kuadro you learn and become more prepared for college entrance exams and ENEM!