QQuestionChemistry
QuestionChemistry
What is the best resonance structure for SCN − , according to computer models and bond lengths?
A. S-C double bond and C-N double bond.
B. S-C single bond and C-N triple bond.
C. S-C triple bond and C-N single bond.
D. S-C single bond and C-N double bond.
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Answer
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Step 1:Let's solve this step by step using structural analysis and bonding principles:
Step 2:: Analyze the Lewis Structure
- SCN⁻ has a total of 16 valence electrons (S: 6, C: 4, N: 5, and 1 extra electron from negative charge) - We need to distribute these electrons to minimize formal charges and maximize electron delocalization
Step 3:: Evaluate Resonance Structures
The SCN⁻ ion has three primary resonance structures: - S-C double bond, C-N single bond - S-C single bond, C-N double bond - S-C single bond, C-N triple bond
Step 4:: Experimental Evidence
- Experimental bond length measurements and computational models show that the actual structure is a hybrid - The C-N bond has significant double bond character - The S-C bond is closer to a single bond
Step 5:: Computational Analysis
- Quantum mechanical calculations indicate electron delocalization - The most stable structure shows partial double bond character between C and N - Experimental bond lengths support a structure with significant electron sharing
Step 6:: Formal Charge Analysis
- The structure with S-C single bond and C-N double bond minimizes formal charges - This structure provides the most stable electron distribution
Final Answer
S-C single bond and C-N double bond. The resonance structure with a single S-C bond and double C-N bond best represents the electronic structure of SCN⁻ according to computational models and experimental bond length measurements.
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