Rates of Br2 addition were measured for a series of alkynes, giving the data shown.
Assuming that Br2 addition to alkynes proceeds through rate- determining formation of a cyclic bromonium ion, what generalizations can you make about the structure of the rate- determining transition state?
Positive charge development at carbons in original triple bond | More important effect of substituents on triple bond |
A. One carbon only | Electron donation |
B. One carbon only | Steric hindrance |
C. Both carbons | Electron donation |
D. Both carbons | Steric hindrance |
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