Key Idea : Generally bond dissaciation energies decreases in a group. Bond dissaciation energy also decreases with repulsion. X−X Bond Bond length (A˚))Bond dissociation energy (kcal/mol)F−F1.4238Cl−Cl1.9957Br−Br2.2845.5I−I2.6735.6 In general the bond dissociation energy decreases as the bond length increases, but the bond dissociation energy of F2 is less than that of Cl2. It is due to greater interelectronic repulsions between the lone pair of electrons on the two bonded fluorine atoms. Hence, the order of bond dissociation energy is as : Cl2>Br2>F2>I2
Which one of the following arrangements does not give the correct picture of the trends indicated against it?
NEET UG 2008 — Chemistry Inorganic Chemistry
Which one of the following arrangements does not give the correct picture of the trends indicated against it?
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
F2>Cl2>Br2>I2 : Oxidising power
- B
F2>Cl2>Br2>I2 : Electron gain enthalpy
- C
F2>Cl2>Br2>I2 : Bond dissociation energy
- D
F2>Cl2>Br2>I2 : Electronegativity
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