Chemical Bonding and Molecular Structure - Result Question 92

####94. Consider the following species :

CN+,CN,NO and CN

Which one of these will have the highest bond order?

[2018]

(a) NO

(b) CN

(c) CN

(d) CN+

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Solution:

  1. (b) $NO:(\sigma 1 s)^{2},(\sigma^{} 1 s)^{2},(\sigma 2 s)^{2},(\sigma^{} 2 s)^{2},(\sigma 2 p_z)^{2},(\pi 2 p_x)^{2}=(\pi 2 p_y)^{2},(\pi^{*} 2 p_x)^{1}=(\pi * 2 p_y)^{0}$

B.O. =1052=2.5

$CN^{-}:(\sigma 1 s)^{2},(\sigma^{} 1 s)^{2},(\sigma 2 s)^{2},(\sigma^{} 2 s)^{2},(\pi 2 p_x)^{2}=(\pi 2 p_y)^{2},(\sigma 2 p_z)^{2}$

B.O. =1042=3

$CN:(\sigma 1 s)^{2},(\sigma^{} 1 s)^{2},(\sigma 2 s)^{2},(\sigma^{} 2 s)^{2},(\pi 2 p_x)^{2}=(\pi 2 p_y)^{2},(\sigma 2 p_z)^{1}$

B.O. =942=2.5

$CN^{+}:(\sigma 1 s)^{2},(\sigma^{} 1 s)^{2},(\sigma 2 s)^{2},(\sigma^{} 2 s)^{2}$,

(π2px)2=(π2py)2

B.O. =842=2

Hence, option (2) should be the right answer.



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