Question

how to count sigma and pi bond,please see question 1 ​

Answer 1

HERE IS YOUR ANSWER.

Then, it is a matter of counting the bonds in the correct Lewis structure according to the following simple rules:

✨Every single covalent bond is a sigma bond.

✨Every double covalent bond has both a sigma and a pi bond in it.

✨Every triple covalent bond has a sigma and two pi bonds in it.

Answer 2

No.of sigma bonds =no.of atoms - 1

And no.of pi bonds =no.of bonds - no.of sigma bonds