Question

Compare the bond lengths $x$ and $y$ for the given molecules:

• A. $x>y$
• B. $y>x$
• C. $x=y$
• D. None of these

Answer 1

The correct option is B $y>x$

In $N_2{O}_4$, $N=O$ bond has will have less s character since oxygen is more electronegative. So $N-N$ bond will have more s character so bond length will be less.
In second structure, lone pair has more s-character therefore $N-N$ bond will have more p character hence hace more bond length as per bent's rule.
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