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Question

Compare the bond lengths x and y for the given 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
In N2O4, N=O bond has will have less s character since oxygen is more electronegative. So NN bond will have more s character so bond length will be less.
In second structure, lone pair has more s-character therefore NN bond will have more p character hence hace more bond length as per bent's rule.
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