Arrange the following bonds according to their average bond energies in descending order: C–Cl, C–Br, C–F, C–I

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Bond energy increases as bond length decreases (shorter bond = stronger bond).

Step 1 — Bond lengths (C–X):
- C–F: ~135 pm (shortest)
- C–Cl: ~177 pm
- C–Br: ~194 pm
- C–I: ~214 pm (longest)

Step 2 — Bond energies (approximate):
- C–F: ~485 kJ/mol (strongest)
- C–Cl: ~327 kJ/mol
- C–Br: ~285 kJ/mol
- C–I: ~213 kJ/mol (weakest)

Descending order: C–F  C–Cl  C–Br  C–I

Answer: Option (1)

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