Arrange the following bonds according to their average bond energies in descending order: C–Cl, C–Br, C–F, C–I
Chemical Bonding · Class 11 · JEE Main Previous Year Question
Arrange the following bonds according to their average bond energies in descending order: C–Cl, C–Br, C–F, C–I
- a✓
C–F > C–Cl > C–Br > C–I
- b
C–Br > C–I > C–Cl > C–F
- c
C–I > C–Br > C–Cl > C–F
- d
C–Cl > C–Br > C–I > C–F
C–F > C–Cl > C–Br > C–I
🧠 Bond energy for C–X bonds: shorter bonds are stronger. Bond length increases with the size of the halogen: C–F < C–Cl < C–Br < C–I. Therefore bond energy decreases in the same order.
| Bond | Approximate energy (kJ/mol) | Bond length (pm) | |---|---|---| | C–F | ~485 | ~135 | | C–Cl | ~330 | ~177 | | C–Br | ~285 | ~194 | | C–I | ~213 | ~214 |
Decreasing bond energy: C–F > C–Cl > C–Br > C–I
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