JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Chemical Bonding and Molecular Structure

The bond order and magnetic property of acetylide ion are same as that of

(A) $NO^{+}$ ✓ Correct
(B) $O_{2}^{+}$
(C) $O_{2}^{-}$
(D) $N_{2}^{+}$

Answer: (A)

Solution

The acetylide ion

C X_{2} X^{2 -}

has

10

valence electrons, a bond order of

3

and no unpaired electrons, so it is diamagnetic. Among the choices,

NO X^{+}

is isoelectronic with it: its

10

bonding and

4

antibonding valence electrons give a bond order of

\frac{10 - 4}{2} = 3

with every electron paired. The remaining species have fractional bond orders and unpaired electrons. Hence the ion with the same bond order and magnetic behaviour as the acetylide ion is

NO X^{+}

JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Single correct option

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