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Which of the following is the correct order of their stability?

$\begin{array}{1 1}(a)\;CN < NO^+ < NO^-&(b)\;NO^- < CN < NO^+ \\(c)\;NO^+ < CN < NO^-&(d)\;CN < NO^- < NO^+\end{array}$

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Higher the bond order,more will be the stability.
$NO^+$ Bond order is 3.0
$CN^+$ Bond order is 2.5
$NO^-$ Bond order is 2.0
Hence (b) is the correct answer.
answered Mar 6, 2014 by sreemathi.v

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