How many sigma and pi bonds are in the molecule shown below?

Sigma bonds: 8

Pi bonds: 1

Question

How many sigma and pi bonds are in the molecule shown below?

Sigma bonds: 8

Pi bonds: 1

BlackTom AI · Accepted Answer

To determine the number of sigma and pi bonds in a molecule, we first analyze its Lewis structure or skeletal formula and count bonds by type.

- General rule: Each single bond consists of one sigma bond. Each multiple bond contains one sigma bond plus additional pi bonds equal to the bond order minus one. For example, a double bond has one sigma and one pi; a triple bond has one sigma and two pi.

- Step-by-step approach (assuming you can see the molecular structure):
  1) Identify every bond in the molecule and classify it as a single, double, or triple bond.
  2) For every single bond, add one sigma bond.
  3) For every double bond, add one sigma and one pi bond.
  4) For every triple bond, add one sigma and two pi bonds.
  5) Sum all sigma bonds and all pi bonds separately.

Given the provided answer values: Sigma bonds = 8 and Pi bonds = 1, this implies the molecule contains:
- One or more double bonds (each contributing one pi bond in total), and
- The rest are single bonds (each contributing one sigma bond), with the total sigma count reaching eight and the total pi count reaching one.

Concretely, if there is exactly one double bond in the molecule and all remaining bonds are single bonds, the counts would be: 1 double bond → 1 sigma + 1 pi, plus N single bonds → N sigma, for a total of N+1 sigma and 1 pi. Setting N+1 = 8 gives N = 7 single bonds, which would yield 8 sigma bonds and 1 pi bond overall.

If you have access to the molecular structure, you can apply the same logic directly: tally single bonds (sigma) and tally each multiple bond’s contribution (sigma + pi) to verify the totals. If the structure shows more than one double/triple bond, you would adjust the pi count accordingly (e.g., two double bonds would give 2 pi, etc.).

Without the image, this is the consistent interpretation that aligns with the stated counts: seven single bonds and one double bond, yielding 8 sigma and 1 pi bonds.

CHEM 110 Section 3 (PM) SP25 Pre-Lecture 21 Quiz C09-3

How many sigma and pi bonds are in the molecule shown below? Sigma bonds: 8 Pi bonds: 1

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