# Homework Help: Total number of C-C sigma bond in phenylethene

1. Jun 23, 2014

### desmond iking

1. The problem statement, all variables and given/known data

how many is total number of C-C sigma bond in phenylethene?

2. Relevant equations

3. The attempt at a solution

i have drawn the the strucutre as in the photo. i ended up getting 8 C-C sigma bond. but the ans from my book is 12. How to get 12?

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2. Jun 23, 2014

### ChiralWaltz

How many sigma (σ) bonds are in a single bond?

How sigma (σ) bonds are in a double bond?

3. Jun 23, 2014

### Saitama

Even after answering those questions, I don't think the OP's answer would change. I would say that the OP is correct and the book has an error.

4. Jun 23, 2014

### desmond iking

1 σ in single bond, 1 σ and 1 pi bond in double bond.

5. Jun 23, 2014

### ChiralWaltz

I would agree that OP is correct and that the number of C-C sigma bonds is 8.