Questions

Which one of the following is expected to have maximum bond length?

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{NO}^{+}

{NO}^{2 +}

NO

{NO}^{-}

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detailed solution

Correct option is D

Electronic configuration follows the order $(σ 2 s) (σ * 2 s) (π 2 p_{x}) (π 2 p_{y}) (σ 2 p_{z}) (π^{*} 2 p_{x})$

${NO}^{+}$ (valence electrons =10); Bond order $= (8 - 2) / 2 = 3$

${NO}^{2 +}$ (valence electrons = 9); Bond order $= (7 - 2) / 2 = 2.5$

$NO$ (valence electrons =11); Bond order $= (8 - 3) / 2 = 2.5$

${NO}^{-}$ (valence electrons =12); Bond order $= (8 - 4) / 2 = 2.0$

Smaller the bond order, larger the bond length. Hence, ${NO}^{-}$ will having maximum bond length.

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