Question

Let the bond order of ${O_2}^{2-}$ be X and that of $CO$ be Y. Then the value of XY is _____?

• A. 2
• B. 6
• C. 3
• D. 4

Answer 1

The correct option is C

3

In this question, we have to check the bond order of each molecule.

→ To get the Bond order, we have to know the number of bonding electrons and number of anti-bonding electrons

→ To get number of bonding electrons and number of anti-bonding electrons. Let's draw MO energy level diagrams of the following species.

Now,

Bond Order =$\frac{1}{2}$[Number of Bonding electrons - Number of Anti Bonding electrons ]

$\Rightarrow$ ${O_2}^{2-}$ $\Rightarrow$ BO = $\frac{1}{2}\times [10-8]$ = 1 = (X)

$CO$ $\Rightarrow$BO = $\frac{1}{2}\times [10-4]$ = 3 = (Y)

Therefore

X $\times$ Y = 1$\times$ 3 = 3