Rank the following resonance structures from most to least significant. 1 N a. 1>2>3>4 b. 1>4>3>2 c. 1>4>2>3 d. 4>1>2>3 2 N 3 N 4

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Chapter1: Chemical Foundations
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**Question 1:** Rank the following resonance structures from most to least significant.

**Structures:**

1. Structure 1: The molecule has a carbonyl group (C=O) and a single-bonded nitrogen atom within a six-membered ring. The oxygen is double-bonded, while the nitrogen does not carry any charge.

2. Structure 2: Similar to Structure 1, but both the oxygen atom connected to the carbonyl and the nitrogen atom carry negative and positive charges, respectively.

3. Structure 3: Both the oxygen double-bonded to the carbon and the nitrogen carry opposite charges (negative on oxygen and positive on nitrogen).

4. Structure 4: Similar to Structure 3, with formal charges distributed similarly.

**Options:**

a. 1 > 2 > 3 > 4  
b. 1 > 4 > 3 > 2  
c. 1 > 4 > 2 > 3  
d. 4 > 1 > 2 > 3  

**Explanation:** When evaluating resonance structures, consider aspects like the stability conferred by the charges, full octets, minimized charge separation, and electronegative atoms bearing negative charges. Structure 1 lacks charge separation, making it potentially more significant, whereas the other structures involve charge separation with formal charges present.
Transcribed Image Text:**Question 1:** Rank the following resonance structures from most to least significant. **Structures:** 1. Structure 1: The molecule has a carbonyl group (C=O) and a single-bonded nitrogen atom within a six-membered ring. The oxygen is double-bonded, while the nitrogen does not carry any charge. 2. Structure 2: Similar to Structure 1, but both the oxygen atom connected to the carbonyl and the nitrogen atom carry negative and positive charges, respectively. 3. Structure 3: Both the oxygen double-bonded to the carbon and the nitrogen carry opposite charges (negative on oxygen and positive on nitrogen). 4. Structure 4: Similar to Structure 3, with formal charges distributed similarly. **Options:** a. 1 > 2 > 3 > 4 b. 1 > 4 > 3 > 2 c. 1 > 4 > 2 > 3 d. 4 > 1 > 2 > 3 **Explanation:** When evaluating resonance structures, consider aspects like the stability conferred by the charges, full octets, minimized charge separation, and electronegative atoms bearing negative charges. Structure 1 lacks charge separation, making it potentially more significant, whereas the other structures involve charge separation with formal charges present.
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