Which one of the following sequence is not in accordance with the property stated against it?
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a
F2>Cl2>Br2>I2: Bond dissociation energy
b
F2>Cl2>Br2>I2: Oxidising power
c
HI>HBr>HCl>HF : Acidic strength
d
F>Cl>Br>I: Electro negativity
answer is A.
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Detailed Solution
X – X bond F−F;38 Cl−Cl;57 Br−Br;45.5 I−I35.6 Bond dissociation energy (kcal/mol) The lower value of bond dissociation energy of fluorine is due to High inter-electronic repulsions between non-bonding electrons in the 2p-orbitals of fluorine. As a result F – F bond is weaker in comparison to Cl – Cl and Br – Br bonds ;