Question

In which of the following transformations, the bond order has increased and the magnetic behaviour has changed?

• A. $C_{2}^{+} \rightarrow C_{2}$
• B. $NO^{+} \rightarrow NO$
• C. $O_{2} \rightarrow O_{2}^{+}$
• D. $N_{2} \rightarrow N_{2}^{+}$

Answer 1

Answer: (A)

On the basis of molecular orbital theory the value of bond order and magnetic nature can be given as
$\underset{\underset{P a r a m a g n e t i c}{B O = 1.5}}{C_{2}^{+}} \rightarrow \underset{\underset{D i a m a g n e t i c}{B O = 2}}{C_{2}}$
$\underset{\underset{D i a m a g n e t i c}{B O = 3}}{N O^{+}} \rightarrow \underset{\underset{P a r a m a g n e t i c}{B O = 2.5}}{N O}$
$\underset{\underset{P a r a m a g n e t i c}{B O = 2}}{O_{2}} \rightarrow \underset{\underset{P a r a m a g n e t i c}{B O = 2.5}}{O_{2}^{+}}$
$\underset{\underset{D i a m a g n e t i c}{B O = 3}}{N_{2}} \rightarrow \underset{\underset{P a r a m a g n e t i c}{B O = 2.5}}{N_{2}^{+}}$