Bond dissociation energy of halogen family decreases down the group as the size of atom increases. The decreasing order for the bond dissociation enthalpy of halogen molecules is Cl2(57kcal/mol)>Br2(45.5kcal/ mol)>F2(38kcal/mol)>I2(35.6 kcal/mol ). A Caution A halogen molecule having larger atoms should have low dissociation energy and vice versa. Fluorine is an exception because of interelectronic repulsion is present in small atom of fluorine
Which one of the following orders is not in accordance with the property stated against it?
NEET UG 2006 — Chemistry Inorganic Chemistry
Which one of the following orders is not in accordance with the property stated against it?
Held on 30 Apr 2006 · Verified 9 Jul 2026.
Options
- A
F2>Cl2>Br2>I2 : bond dissociation energy
- B
F2>Cl2>Br2>I2 : oxidising power
- C
HI>HBr>HCI>HF; acidic property in water
- D
F2>Cl2>Br2>I2 : electronegativity
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