The correct order for triple bond energy in CO, N2, CN and –– with respective MOT:

Dear Student,

As we know, when a bond is strong, there is a higher bond energy because it takes more energy to break a strong bond, which is correlates with bond order and bond length. When the bond order is higher, bond length is shorter, and the shorter the bond length the greater the bond energy.

Bond order = 1/2(antibonding electrons- bonding electrons)
But here all have same bond order,N2 =CO=CN= CC=3, So we need to compare with different parameter . 
N  is more  electronegative atom then O,C ,the order is as follows,
Hence, the correct order of boning energy 
N2 > CO> CN> CC


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