Problem: Draw the Lewis structure for the molecule C3H4. How many sigma and pi bonds does it contain?a) 8 sigma, 2 pib) 10 sigma, 2 pic) 6 sigma, 2 pid) 8 sigma, 0 pie0 7 sigma, 0 pi

We’re being asked to determine the number of σ and π bonds in C₃H₄. 

Carbon is the internal atom

• H → can not be a central atom

          Group            Valence Electrons

C         4A                   3 × 4 e^– = 12 e^–

H         1A                   4 × 1 e^– = 4 e^–

         Total:  18 valence e^–