Consider the following species: C N + , C N - , N O and CN Which one of these will have the highest bond order?

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Using M.O theory N O : ( σ 1 s ) 2 , ( σ * 1 s ) 2 , ( σ 2 s ) 2 , ( σ * 2 s ) 2 , ( σ 2 p z ) 2 , ( π 2 p x ) 2 = ( π 2 p y ) 2 , ( π * 2 p x ) 1 = ( π * 2 p y ) 0 B O = 10 - 5 2 = 2.5 C N - : ( σ 1 s ) 2 , ( σ * 1 s ) 2 , ( σ 2 s ) 2 , ( σ * 2 s ) 2 , ( π 2 p x ) 2 = ( π 2 p y ) 2 , ( σ 2 p z ) 2 B O = 10 - 4 2 = 3 C N : ( σ 1 s ) 2 , ( σ * 1 s ) 2 , ( σ 2 s ) 2 , ( σ * 2 s ) 2 , ( π 2 p x ) 2 = ( π 2 p y ) 2 , ( σ 2 p z ) 1 B O = 9 - 4 2 = 2.5 C N + : ( σ 1 s ) 2 , ( σ * 1 s ) 2 , ( σ 2 s ) 2 , ( σ * 2 s ) 2 , ( π 2 p x ) 2 = ( π 2 p y ) 2 B O = 8 - 4 2 = 2

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