NEST2013ChemistryHaloalkanes and Haloarenes
The addition of hydrogen bromide to an unsymmetrical alkene in the presence of a peroxide does not follow Markovnikov rule. The mechanism is a radical mechanism and is illustrated below Combination of any two radicals is a chain termination step and gives rise to a neutral molecule. Addition of HCl and HF under all conditions follows Markovnikov rule. (Given the bond energies: HF =565 ~kJ ~mol ⁻¹, HCl =431 ~kJ ~mol ⁻
Options
- AIn step (iii), the attack of bromine atom on propene takes place at the first carbon atom as it is less hinder
- BStep (ii) is endothermic if HF is used instead of HBr and exothermic if HI is used.
- CBromotrichloromethane adds to 1-hexene on heating in the presence of a peroxide to form CH ₃ ( CH ₂ )₃ CH ( Br
- DEndothermicity of step (i) makes the overall process very slow.
Correct answer
C. Bromotrichloromethane adds to 1-hexene on heating in the presence of a peroxide to form CH ₃ ( CH ₂ )₃ CH ( Br
Step-by-step solution
No solution available.