Which of the following species has the largest bond length?

Which of the following species has the largest bond length?

A
$N_{2}^{+}$
B
$N_{2}$
C
$N_{2}^{-}$
D
$N_{2}^{2 -}$

Solution:

$N_{2}^{2 -}$ has the minimum bond order (= 2), hence largest bond length.

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