The Lewis structure for molecule below has _____ σ bonds and ______ π bonds.

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Question restatement: The Lewis structure for the molecule shown has _____ σ bonds and ______ π bonds. Answer options are: 1) 13, 3  2) 13, 2  3) 11, 5  4) 11, 2  5) I am unsure and need to study this concept to prepare for the exam.

Step-by-step analysis of each option:

Option 1: "13, 3". To evaluate this, count all single bonds as σ (sigma) bonds and all double or triple bonds contribute π bonds in addition to σ. In a typical organic Lewis structure with several single bonds (C–H, C–C, C–N, C–O, etc.), plus any multiple bonds (double or triple), you can accumulate a relatively large number of σ bonds from each single bond and a smaller number of π bonds from the multiple bonds. If the depicted molecule features multiple single bonds along a carbon chain and a few multiple bonds (for example, a nitrile C≡N contributing 1 σ and 2 π, and a carbonyl C=O contributing 1 σ and 1 π, plus the remaining single bonds), a count around 13 σ bonds and a few π bonds is plausible. This option seems consistent with a structure containing several single bonds and a handful of multiple bonds.

Option 2: "13, 2". You would expect 2 π bonds only if there are exactly two multiple-bond connections (e.g., two double bonds or one triple bond contributing two π bonds). If the molecule includes a nitrile group (C≡N) that contributes 2 π bonds, plus a carbonyl (C=O) that contributes 1 π bond, you would already have at least 3 π bonds. Therefore, claiming only 2 π bonds would likely underestimate the number of π bonds present in this kind of structure. This makes Option 2 less plausible given the typical Lewis patterns here.

Option 3: "11, 5". Having 5 π bonds would require several multiple bonds (e.g., three double bonds or one triple bond and other doubles) in the depicted arrangement. The shown structure appears to have several single bonds along a hydrocarbon backbone with only a couple of multiple-bond features (likely one nitrile C≡N and one carbonyl C=O, each contributing π bonds). Five π bonds is high for this fragment, making this option seem overly large for the π count given the apparent connectivity.

Option 4: "11, 2". Here the π-bond count is 2. As discussed for Option 2, a nitrile group contributes 2 π bonds on its own, and a carbonyl contributes 1 π bond, so unless the molecule lacks a carbonyl or nitrile, having only 2 π bonds is unlikely. Therefore this option undercounts π bonds for the shown structure if both nitrile and carbonyl-like features are present.

Option 5: "I am unsure and need to study this concept to prepare for the exam". If you’re uncertain about counting σ and π bonds from a Lewis structure, you should review bond types (single vs multiple), how to count σ versus π contributions, and practice with similar diagrams. This option represents an acknowledgment of uncertainty rather than an answer choice about bond counts.

Synthesis across options: The most consistent interpretation of a structure containing a nitrile group (C≡N) and a carbonyl-like or highly substituted carbon backbone typically yields a higher σ count with a moderate π count (not extremely high). Among the provided numerical pairs, 13 σ bonds with 3 π bonds aligns with a structure that has many single bonds plus at least two multiple-bond regions contributing a total of three π bonds. The option stating 11 σ bonds with 5 π bonds would require more multiple-bond content than the diagram suggests, and 13 σ with 2 π or 11 σ with 2 π would undercount π bonds given the presence of nitrile and possibly carbonyl features. The uncertainty option is not a bond-count and should be used only if you cannot determine the counts.

Conclusion statement (informational, not a final answer): Based on the typical bond distribution in this diagram, the combination that best fits the observed bonding pattern—several σ bonds from single bonds and a small number of π bonds from multiple bonds—corresponds to the option with 13 σ bonds and 3 π bonds.

CHEM 1210 AU2025 (15738) CHEM 1210 Practice Exam #4 v2 (Ch 7.1–7.4, 8, 9.1–9.6)- Requires Respondus LockDown Browser

The Lewis structure for molecule below has _ σ bonds and __ π bonds.

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