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Hydrocarbons — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons1 Mark
MCQ
Bromination of an alkane as compared to chlorination proceeds $ ..........$
  • ✓
    At a slower rate
  • B
    At a faster rate
  • C
    With equal rate
  • D
    With equal rate $($or$)$ different rate depending upon the temperature.
✓

Answer

Correct option: A.
At a slower rate
Bromination of an alkane occurs at a slower rate than chlorination of an alkane.
As we know that halogenation involves the formation of a carbon $-$ halogen bond.
Now, the ease of halogenation will certainly depend on the carbon $-$ halogen bond strength.
Bond formation energy of $\ce{C−Cl}$ is higher than that of $\ce{C−Br}$ bond.
So, the ease of bromination is lower than the ease of chlorination.

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