The bond dissociation energy is highest for

Question

Canvas Classes · Accepted Answer

Bond dissociation energy of halogens follows an unusual trend due to lone pair repulsions.

Step 1 — Bond dissociation energies (approximate):

| Halogen | Bond energy (kJ/mol) |
|---------|---------------------|
|  | 158 (weak due to lone pair–lone pair repulsion in small F) |
|  | 243 (strongest among halogens) |
|  | 193 |
|  | 151 |

Step 2 — Reasoning:
-  has unexpectedly low bond energy due to strong lone pair–lone pair repulsion between the small, compact F atoms
-  has the highest bond d

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