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MHT CET202411 May 2024Morning ShiftChemistryHaloalkanes and HaloarenesActual

Which alkyl halide has highest bond enthalpy of C - X bond?

Options

  1. ACH ₃- Cl
  2. BCH ₃- F
  3. CCH ₃- Br
  4. DCH ₃- I

Correct answer

B. CH ₃- F

Step-by-step solution

As the size of halogen increases from F to I , C - X bond length increases and C - X bond strength decreases. With decrease in bond strength, it becomes easier to break the bond by applying minimum energy. C - F bond length is the shortest, so C - F bond strength is highest and CH ₃ ~F has the highest bond enthalpy.

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