# Homework Help: How much segma bonds are there ?

1. Oct 14, 2008

### UNknown 2010

Last edited by a moderator: May 3, 2017
2. Oct 14, 2008

### Staff: Mentor

I suppose you mean sigma bonds.

Looks like you may be missing several. That's because the picture is lousy.

3. Oct 14, 2008

### GCT

Last edited by a moderator: May 3, 2017
4. Oct 15, 2008

### Staff: Mentor

You did the same mistake UNknown2010 did - you assumed the picture is OK.

5. Oct 15, 2008

### GCT

Right , to the OP - do not forget about the hydrogens on the cyclic carbons.

6. Oct 15, 2008

### UNknown 2010

do you mean (CH2) ? I counted it !

7. Oct 15, 2008

### Staff: Mentor

There are three trivalent carbons on the picture.

8. Oct 15, 2008

### GCT

No the hydrogens attached to the cyclic carbons , note that carbon is tetravalent , this means it forms four bonds , it is assumed all of those carbons with three bonds on the cyclic motif has hydrogens attached to them.

9. Oct 15, 2008

### raglandrb

it helps when drawing line angle structures to label all the explicit H's. If you look closer at your ring, the way its drawn you have 4 sp2 hybridized carbons, when theres really only 1, the carbonyl.

10. Oct 16, 2008

### UNknown 2010

Oh that picture has a mistake

http://img126.imageshack.us/my.php?image=89476797ug7az1.png
I counted sigma bonds and they were 19 !!

11. Oct 16, 2008

### Staff: Mentor

Last edited by a moderator: May 3, 2017
12. Oct 16, 2008

### UNknown 2010

http://img518.imageshack.us/img518/3377/64147087fe5.png [Broken]

Last edited by a moderator: May 3, 2017
13. Oct 16, 2008

### Staff: Mentor

Geez...

Please check if ALL carbons are tetravalent.

Like in: you look at the carbon, you count 1, 2, 3, 4 and then you move to the next one.