Question

Which of the following statements are correct?
I. Bond order of $NO$ is $2.5$
II. Bond order of $NO ^{+}$is $3.0$
III. Bond order of $O _{2}$ is $1.5$
IV. Bond order of $CO$ is $3.0$

• A. I, II, III
• B. II, III, IV
• C. I, II, IV
• D. II, IV

Answer 1

Answer: (C)

$NO =15=\sigma 1 s ^{2}, \sigma^{*} 1 s ^{2}, \sigma 2 s ^{2}, \sigma^{*} 2 s ^{2}, \sigma 2 p _{ z }^{2}, \sigma 2 p _{ x }^{2}=\pi 2 p _{ y }^{2}, \pi 2 p _{ x }{ }^{1} $
B.O $=\frac{10-5}{2}=2.5$
$NO ^{+}=14=\sigma 1 s ^{2}, \sigma^{*} 1 s ^{2}, \sigma 2 s ^{2}, \sigma^{*} 2 s ^{2}, \sigma 2 p _{ z }^{2}, \sigma 2 p _{ x }^{2}=\pi 2 p _{ y }^{2}, \pi 2 p _{ x }^{2}, \pi^{*} 2 p _{ x }{ }^{0} $
B.O $=\frac{10-4}{2}=3$
$O _{2}=16=\sigma 1 s ^{2}, \sigma^{*} 1 s ^{2}, \sigma 2 s ^{2}, \sigma^{*} 2 s ^{2}, \sigma 2 p _{ z }^{2}, \pi 2 p _{ x }^{2}=\pi 2 p _{ y }^{2}, \pi 2 p _{ x }{ }^{0} $
B.O $=\frac{10-6}{2}=2$
$C O=14=\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \pi^{*} 2_{x}^{2}=\pi 2 p_{y}^{2}, \sigma 2 p_{z}^{2}, \sigma^{*} 2 p s^{2} $
B.O $=\frac{10-4}{2}=3$