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Question

Compare BB bond lengths in the following molecules:

A
x>y
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B
y>x
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C
x=y
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D
None of these
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Solution

The correct option is B y>x
Fluorine is an electron negative element so as per bent's rule more electronegative element will have less % s- character therefore BB bond will have more % s- character and shorter bond length.
Similarly, in B2Cl6 chlorine is less elelctronegative hence will have more % s charecter hence the BB bond angle will have less % s character and hence longer bond length.
The side atom in the 1st case is F which is more electronegative than the side atom chlorine in the 2nd case.

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