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NEET 2021
Exam
NEET
Year
2021
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

NEET 2021 · Chemistry · Chemical Bonding and Molecular Structure

The correct sequence of bond enthalpy of ' C-X bond is:

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

Options

  1. ACH3−F<CH3−Cl<CH3−Br<CH3−I{CH}_{3} - F < {CH}_{3} - Cl < {CH}_{3} - Br < {CH}_{3} - I.
  2. BCH3−F>CH3−Cl>CH3−Br>CH3−I{CH}_{3} - F > {CH}_{3} - Cl > {CH}_{3} - Br > {CH}_{3} - I
  3. CCH3−FCH3−Br>CH3−I{CH}_{3} - F {CH}_{3} - Br > {CH}_{3} - I
  4. DCH3−Cl>CH3−F>CH3−Br>CH3−I{CH}_{3} - Cl > {CH}_{3} - F > {CH}_{3} - Br > {CH}_{3} - I

Correct answer

B. CH3−F>CH3−Cl>CH3−Br>CH3−I{CH}_{3} - F > {CH}_{3} - Cl > {CH}_{3} - Br > {CH}_{3} - I

Step-by-step solution

Bond enthalpy is inversely proportional to the bond length. The bond length order of C−XC - X bond in methyl halides depends on the size of the halogen atom. Bond length order: CH3−F<CH3−Cl<CH3−Br<CH3−I{CH}_{3} - F < {CH}_{3} - Cl < {CH}_{3} - Br < {CH}_{3} - I

Hence, bond enthalpy order is

CH3−F>CH3−Cl>CH3−Br>CH3−I{CH}_{3} - F > {CH}_{3} - Cl > {CH}_{3} - Br > {CH}_{3} - I

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