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Q.

Which one is the strongest bond?

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a

F – F

b

Cl–F

c

Br – Cl

d

Br – F

answer is C.

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Detailed Solution

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  • The bond energy depends upon the values of electronegativity and electron repulsions. 
  • Generally, electronegativity is directly proportional to bond energy, in that case F−F bond should be the strongest bond.
  •  But due to the small size of fluorine atoms, F−F bond has high electron repulsions which leads to weaker bonds which leads to Cl−F as the strongest bond.
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