NEET 2017 · ChemistryMO theoryPrevious Year Question

Which one of the following pairs of species have the same bond order?

Answer: (C) $CN X^{-}$ , $CO$ . \textbf{Answer:} (C) $CN X^{-}$ , $CO$ \textbf{Solution:} $CN X^{-}$ ( $14$ e $^{-}$ ) and $CO$ ( $14$ e $^{-}$ ) are isoelectronic, both with bond order $3$ .

A. $CO$ , $NO$
B. $O X_{2} X^{-}$ , $NO X^{+}$
C. $CN X^{-}$ , $CO$ ✓
D. $N X_{2}$ , $O X_{2} X^{-}$

Correct Answer

Solution & Explanation

\textbf{Answer:} (C) $CN X^{-}$ , $CO$ \textbf{Solution:} $CN X^{-}$ ( $14$ e $^{-}$ ) and $CO$ ( $14$ e $^{-}$ ) are isoelectronic, both with bond order $3$ . $NO$ has bond order $2.5$ , $O X_{2} X^{-}$ has $1.5$ , while $NO X^{+}$ and $N X_{2}$ have $3$ . Only the $CN X^{-}$ / $CO$ pair share the same bond order.

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