The correct sequence of bond enthalpy of ' $\mathrm{C}-\mathrm{X}$ bond is:

The correct sequence of bond enthalpy of ' $\mathrm{C}-\mathrm{X}$ bond is:
  1. CH3-F<CH3-Cl<CH3-Br<CH3-I.
  2. CH3-F>CH3-Cl>CH3-Br>CH3-I
  3. CH3-F<CH3-Cl>CH3-Br>CH3-I
  4. CH3-Cl>CH3-F>CH3-Br>CH3-I

Solution

Bond enthalpy is inversely proportional to the bond length. The bond length order of C-X bond in methyl halides depends on the size of the halogen atom. Bond length order: CH3-F<CH3-Cl<CH3-Br<CH3-I

Hence, bond enthalpy order is

CH3-F>CH3-Cl>CH3-Br>CH3-I

Asked in: NEET 2021

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