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

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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 e12 e

H         1A                   4 × 1 e4 e

         Total:  18 valence e

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Problem Details

Draw the Lewis structure for the molecule C3H4. How many sigma and pi bonds does it contain?

a) 8 sigma, 2 pi

b) 10 sigma, 2 pi

c) 6 sigma, 2 pi

d) 8 sigma, 0 pi

e0 7 sigma, 0 pi