Achieve Homework #4, Question #15

[trishaferrer]

How can you determine how many pi and sigma bonds a molecule has? Such as in this question?

[Sean Sanders 1E]

Hi, you can determine the number of sigma and pi bonds by first identifying the types of bonds in a molecule. A single bond has one sigma bond, a double bond has one sigma bond and one pi bond, and a triple bond has one sigma bond and two pi bonds. From here, you can add the number of sigma bonds together and the number of pi bonds together to find the total number of each in a molecule. Hope this helps!

[erud]

If you make an attempt it usually tells you the information that a single bond has one o bond, a double bond has one o bond and one pi bond, and a triple bond has one o bond and two pi bonds. You would then just count them from looking at the molecule.

[Wilson Zheng 1L]

Every single bond has one sigma bond, whereas a double bond has one sigma and one pi bond (in bonds where the number > 1, there can only exist one sigma bond but there can be numerous pi bonds present)!

[Leo Chang 2H]

Hi,

First, to identify the number of sigma bonds, you count every bond present; every covalent bond has one sigma bond. Both double and triple bonds are counted as having one sigma bond.

Next, for pi bonds, you look at the double and triple bonds present in the molecule. For the double bonds, there is one pi bond present. For the triple bond, there is two pi bonds present. This is because one of the bonds in a multibond system is always a sigma bond, as sigma bonds will form before pi bonds.

In this example, there would be 5 sigma bonds and 3 pi bonds.

I hope this helps!

[Abby Citro 2A]

To first identify the number of sigma bonds, you just need to count the number of bonds present, as every bond has at least a sigma bond. Next, you need to check the number of double and triple bonds present in the molecule. Double bonds have a sigma bond and a pi bond, triple bonds have a sigma bond and two pi bonds, etc.

[Tanvi Akula 2K]

Each bond has 1 sigma bond, so if you count the total number of bonds, there are 4 bonds in the molecule, which means 4 sigma bonds. Now you need to account for that double bond and the triple bond. For double bonds there are 1 sigma and 1 pi bond, since you already accounted for the sigma bond, now you know that the other bond is a pi bond. Now going to the triple bonds (they have 1 sigma bond and 2 pi bonds), which gives us another 2 pi bonds. So now you would have a total of 4 sigma bonds, and 3 pi bonds. Hope that helps!

[Ashley Tonthat 2B]

Hello,

Every bond (single, double, or tripe) has a sigma bond, so count each bond you see as 1 sigma bond. Double bonds have 1 pi bond and triple bonds have 2 pi bonds. Count the number of double and triple bonds you have, and this is how you can count how many pi bonds you have. Hope this helps.

[Raizel Ferrer 1H]

A single bond has one sigma bond. A double bond has one sigma bond and one pi bond. A triple bond has one sigma bond and 2 pi bonds. The structure has at least 5 bonds in total so that means there are 5 sigma bonds. The structure has one double bond and one triple bond so the structure also has 3 pi bonds.

[BB Dis 1H]

For every bond there is one sigma bond. Then, for double bonds on top of the sigma bond there is one pi bond. For triple bonds there would be one sigma bond and two pi bonds.

[905740390]

a sigma bond is any bond that is a single bond, however in double and triple bonds, there is 1 sigma bond

[Sally_Luo_3F]

sigma bonds apply to all bonds (single, double, triple), but pi bonds only apply to double/triple bonds. Start by counting all the bonds (=the # of sigma bonds), then count how many double/triple bond is there (= the # of pi bonds).

[Isabelle Kludt 2B]

all of the bonds will have one sigma bond and then double bonds will have one pi bond and triple will have 2 pi bonds.

[Madelyn_Rios_2c]

A single bond has one sigma bond, a double bond has one sigma and one pi, and a triple bond will have one sigma and 2 pi.