Question

Question 4.28 What is the total number of sigma and pi bonds in the following molecules?

(a) C2H2

(b) C2H4

Class XI Chemical Bonding and Molecular Structure Page 131

Answer 1

concept :- Each single bond is a sigma bond , a double bond contains one sigma bond and one pi bond and a triple bond contains two pi bonds and one sigma bond.

so, we have to draw structure of the given molecule and count the number of sigma and pi bond .

(a) sigma bond = 3
pi bond = 2

(b) sigma bond = 5
pi bond = 1