How many sigma and pi bonds are present in the molecule hcn?

Hydrogen cyanide (HCN) contains two (2) sigma bonds and two (2) pi bonds.

Explanation:

Hydrogen cyanide can be represented structurally as:

H-C≡ N

From the structural formula, we can see:

One C-H sigma bond

While the C≡ N bond contains One Sigma and two (2) pi bonds.