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Q.

Which of the following is incorrect with respect to property indicated ?

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a

Electro Negativity: F > Cl > Br

b

Electron Affinity: Cl > Br < F

c

Oxidising power: F2 > Cl2 > Br2

d

Bond energy: F2 > Cl2 > Br2

answer is D.

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Detailed Solution

Bond lengths of halogens are in the order :  F2 < Cl2 < Br2 Bond energies are expected in the order : F2 > Cl2 > Br2But the experimental bond enthalpies are :Cl2 > Br2 > F2, Bond enthalpy of F2 is very less, because lone pair - lone pair repulsions are appreciable in F2 as the bond length is small in F2.
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