Problem: How many sigma (σ) and pi (π) bonds are in a molecule of acetone, (CH3)2CO?a) 9 σ, 2 πb) 8 σ, 1 πc) 8 σ, 2 πd) 9 σ, 1 πe) 10 σ, 0 π

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We’re being asked to determine the number of σ and π bonds in (CH3)2CO


Carbon is the internal atom

  • H → can not be a central atom
  • O → less electronegative than C


          Group            Valence Electrons

C         4A                   3 × 4 e12 e

O          6A                   1 × 6 e6 e

H         1A                   6 × 1 e6 e

         Total:  24 valence e

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Problem Details

How many sigma (σ) and pi (π) bonds are in a molecule of acetone, (CH3)2CO?

a) 9 σ, 2 π

b) 8 σ, 1 π

c) 8 σ, 2 π

d) 9 σ, 1 π

e) 10 σ, 0 π

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Lewis Dot Structures: Sigma & Pi Bonds concept. You can view video lessons to learn Lewis Dot Structures: Sigma & Pi Bonds. Or if you need more Lewis Dot Structures: Sigma & Pi Bonds practice, you can also practice Lewis Dot Structures: Sigma & Pi Bonds practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Jensen's class at UGA.