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the trend for bond dissociation energy of halogens is Cl2>Br2>F2>I2... But as we move down in group strength of intermolecular forces increase( in case of halogens LDF) because of increasing polarizability so there should be more energy needed to break I-I bond(in addition to strong LDF it is in solid state also) but it doesnโ€™t happens actually bcz in given trend Cl-Cl bond has greatest dissociation energy.....now plzzzz explain this all why not this trend I2>Br2>Cl2>F2?????

shy , 7 Years ago
Grade 12th pass
anser 2 Answers
Arun

The Bond dissociation energy of halogens decreases down the group as the size of the halogen is increases .

The bond dissociation energy of fluorine is however, lower than chlorine and bromine due to its small size its inter electronic repulsion is very high .

That's why the the bond dissociation enthalpy follows the order Cl2 >Br2>F2>I2.

Last Activity: 7 Years ago
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