Multiple Choice
In the absence of peroxides, hydrohalogenation of alkenes with proceeds via carbocation formation. Which alkene reacts fastest with under these conditions?
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10. Addition Reactions
Hydrohalogenation
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Which arrow pushing formalism best represents the first step of the hydrohalogenation reaction?
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Verified step by step guidance1
Identify the reactants involved in the hydrohalogenation reaction. In this case, the reactants are an alkene and hydrogen bromide (H-Br).
Understand the mechanism of hydrohalogenation, which involves the addition of a hydrogen halide across the double bond of an alkene.
Recognize that the first step in the mechanism is the protonation of the alkene. This involves the pi electrons of the double bond attacking the hydrogen atom of H-Br.
Visualize the movement of electrons: the pi bond electrons from the alkene form a bond with the hydrogen atom, resulting in the formation of a carbocation intermediate.
Note that the bond between hydrogen and bromine in H-Br breaks, with the electrons moving to the bromine atom, forming a bromide ion (Br-).
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