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9. Hydricarbon — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
In the presence of peroxide, $HCl$ and $HI$ do not give anti-Markownikoff's addition of alkenes because
  • ✓
    One of the steps is endothermic in $HCl$ and $HI$
  • B
    Both $HCl$ and $HI$ are strong acids
  • C
    $HCl$ is oxidizing and the $HI$ is reducing
  • D
    All the steps are exothermic is $HCl$ and $HI$
✓

Answer

Correct option: A.
One of the steps is endothermic in $HCl$ and $HI$
a
Anti-Markownikoff addition is possible only in case of $HBr$ and not in $HCl$ and $HI$. In $HBr$ both the chain initiation and propagation steps are exothermic, while in $HCl,$ first step is  Exothermic, and second step is endothermic and in $HI,$ no step is exothermic. Hence $HCl$ and $HI$ do not undergo anti-Markownikoff's addition.

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