What is the bond - order of CN ?[Note : Write the answer after multiplying it with 4]

CN has 13 electrons 

Electronic configuration

Bond order = 12[B-A]

B = no. of electron in bonding orbital 

A = no. of electron in  anti bonding orbital 

In CN B = 9

A = 4

Bond order = 12[9-4] = 2.5

Bond order = 2.5 x 4 = 10

Hence the correct answer is bond order = 10