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

Sigma bonds:
[ Select ]
3
6
8
2
9
4
5
7
0
1
10

Pi bonds:
[ Select ]
9
5
7
10
3
6
4
2
0
8
1

Question

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

Sigma bonds: 
[ Select ]
3
6
8
2
9
4
5
7
0
1
10

Pi bonds: 
[ Select ]
9
5
7
10
3
6
4
2
0
8
1

BlackTom AI · Accepted Answer

To determine the number of sigma and pi bonds in a molecule, we need to inspect the molecular diagram or formula to count bonds between atoms and to identify multiple bonds.

Step 1: Clarify what counts as a sigma bond vs a pi bond.
- Each bond between two atoms consists of at least one sigma (σ) bond. In a single bond, there is exactly one σ bond and no π bonds.
- In a double bond, there is one σ bond and one π bond.
- In a triple bond, there is one σ bond and two π bonds.
- So, the total number of σ bonds is the count of all bonds, where multiple bonds contribute exactly one σ per bond type (double or triple), plus any single bonds.

Step 2: How to count from the diagram (general approach, since the image isn’t described here).
- Identify every bond line between atoms and tally them as σ bonds. For every double bond, remember that it contributes one additional π bond beyond the σ bond, and for every triple bond, there are two π bonds in addition to the shared σ bond.
- For rings or branching, systematically traverse each connection to ensure no bond is double-counted.
- If there are any resonance structures, consider the bond order in the major contributor for π-bond counting, but remember that the total number of π bonds corresponds to the number of π-overlaps present in the structure, typically visible as each non-sigma component of a multiple bond.

Step 3: Apply to the provided dropdown options conceptually.
- The sigma-bond count is selected from the first set of options (e.g., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10). You should pick the number that matches the total σ bonds in the depicted molecule after counting all single bonds plus the σ component of any double or triple bonds.
- The pi-bond count is selected from the second set of options (e.g., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10). You should pick the number that matches the total π bonds, which equals the number of extra bonds in double and triple bonds (one π per double bond, two π per triple bond).

Step 4: Common pitfalls to watch for.
- Miscounting double or triple bonds: forget that a double bond still contains exactly one σ bond and one π bond.
- Overlooking multiple bonds in rings or aromatic systems: in benzene-like aromatic rings, each C=C is typically represented as a resonance blend, but each C=C contributes one π bond in the localized representation; aromatic systems can complicate a simple count if resonance is considered, so use the standard representation given in the image.
- Counting lone pairs as bonds: lone pairs do not contribute to σ or π bond counts, so do not include them in the tally.

Step 5: If you’re stuck, a methodical counting checklist helps:
- Step A: Count all single bonds (each is one σ).
- Step B: For every double bond, add one π bond on top of the σ contribution.
- Step C: For every triple bond, add two π bonds on top of the σ contribution.
- Step D: Verify totals by cross-checking each atom’s valence and ensuring the sum of σ bonds equals the total number of bonds incident to atoms, adjusted for multiple bonds as described.

Note: Because the actual molecular diagram isn’t described here, I can’t provide the precise numeric counts for σ and π bonds in this specific molecule. Use the approach above directly on the image to determine the correct numbers, then compare with the available dropdown options to select the matching values.

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: [ Select ] 3 6 8 2 9 4 5 7 0 1 10 Pi bonds: [ Select ] 9 5 7 10 3 6 4 2 0 8 1

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