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  4. Which of the following have identical bond order? (I) CN- (II) O2 - (III) NO+ (IV) CN+

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Q. Which of the following have identical bond order?
(I) $CN^-$$\quad$ (II) $O_2 ^-$ $\quad$(III) $NO^+$$\quad$ (IV) $CN^+$

Chemical Bonding and Molecular Structure

Solution:

Isoelectronic species have same bond order.
$CN^- = 6 + 7 + 1 = 14$ electrons,
$O_2^ - = 8 + 8 + 1 = 17$ electrons,
$NO^+ = 7 + 8 - 1 = 14$ electrons,
$CN^+ = 6 + 7 - 1 = 12$ electrons.