Which of the following represent resonance structures of the top structure? (Select all correct answers) A E F

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**Resonance Structures Identification**

**Question:**
Which of the following represent resonance structures of the top structure? (Select all correct answers)

**Top Structure:**
The original structure exhibits resonance, indicated by a double-headed arrow between two forms of the same molecule. The structure is a carbon chain ending with a carbonyl group (C=O) and a negatively charged oxygen (O⁻).

**Possible Resonance Structures:**

**A.**
- A carbon chain with a double bond at the second carbon and another double bond to oxygen with a negatively charged oxygen atom adjacent to it.

**B.**
- A carbon chain with a double bond at the end, adjacent to a carbonyl group (C=O) and a negatively charged oxygen atom on the carbonyl group.

**C.**
- A carbon chain with a carbonyl group (C=O) at the first carbon, and a negatively charged oxygen atom at the end of the chain.

**D.**
- A carbon chain with a double bond at the first carbon, adjacent to a carbonyl group (C=O) and a negatively charged oxygen atom on the carbonyl group.

**E.**
- A carbon chain with a carbonyl group (C=O) at the first carbon, and a negatively charged oxygen atom at the second carbon, adjacent to a double bond at the end of the chain.

**F.**
- A carbon chain with a double bond at the last carbon, adjacent to a carbonyl group (C=O) and a negatively charged oxygen atom on the opposite end.

To determine which of these options represent the actual resonance structures of the original structure, one should analyze the delocalization of electrons via double bonds and lone pairs to see which forms retain the validity of the structure without breaking any fundamental chemistry rules (like exceeding the octet for carbon).

In this case, the correct answers can be identified as those which properly depict the electron movement around the pi bonds:

**Correct answers:**
- Options A, B, and D are correct resonance structures. They follow the resonance rules where the positions of the electrons are shifted within the structure but the connectivity of atoms remains the same.
Transcribed Image Text:**Resonance Structures Identification** **Question:** Which of the following represent resonance structures of the top structure? (Select all correct answers) **Top Structure:** The original structure exhibits resonance, indicated by a double-headed arrow between two forms of the same molecule. The structure is a carbon chain ending with a carbonyl group (C=O) and a negatively charged oxygen (O⁻). **Possible Resonance Structures:** **A.** - A carbon chain with a double bond at the second carbon and another double bond to oxygen with a negatively charged oxygen atom adjacent to it. **B.** - A carbon chain with a double bond at the end, adjacent to a carbonyl group (C=O) and a negatively charged oxygen atom on the carbonyl group. **C.** - A carbon chain with a carbonyl group (C=O) at the first carbon, and a negatively charged oxygen atom at the end of the chain. **D.** - A carbon chain with a double bond at the first carbon, adjacent to a carbonyl group (C=O) and a negatively charged oxygen atom on the carbonyl group. **E.** - A carbon chain with a carbonyl group (C=O) at the first carbon, and a negatively charged oxygen atom at the second carbon, adjacent to a double bond at the end of the chain. **F.** - A carbon chain with a double bond at the last carbon, adjacent to a carbonyl group (C=O) and a negatively charged oxygen atom on the opposite end. To determine which of these options represent the actual resonance structures of the original structure, one should analyze the delocalization of electrons via double bonds and lone pairs to see which forms retain the validity of the structure without breaking any fundamental chemistry rules (like exceeding the octet for carbon). In this case, the correct answers can be identified as those which properly depict the electron movement around the pi bonds: **Correct answers:** - Options A, B, and D are correct resonance structures. They follow the resonance rules where the positions of the electrons are shifted within the structure but the connectivity of atoms remains the same.
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