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Q.

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 ;
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Which one of the following sequence is not in accordance with the property stated against it?