Anti-Markovnikov's rule for addition of HBr is not observed in:
Propene
Propane
2-Pentene
2-Butene
Anti-Markovnikov's rule is followed only in case of unsymmetrical alkenes.
In which of the following, addition of HBr does not take place against Markownikoff's rule? In other words, Anti- Markownikoff's addition of HBr is not observed for