In the HCN molecule there are?

Question

a) 3 sigma and 1 pi bonds

b) 1 sigma and 3 pi bonds

c) 3 sigma and 2 pi bonds

d) 2 sigma and 2 pi bonds

e) 2 sigma and 1 pi bonds

please explain this to me the answer is d. Will give 5 pts to best answer

Answer 1

The number of sigma bonds is the total number of unions between atoms. The structure of HCN is H-C≡N, hence, there are two sigma bonds. Additionally, each double bond contributes one pi bond, and each triple bond contributes two pi bonds. Therefore, there are two sigma bonds and two pi bonds in HCN.