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QuestionChemistry

Of the three choices below, choose the best Lewis structure for OCl^2. A. ⋯Cl−⋯O−⋯Cl B. ⋯Cl−:O−⋯Cl C. ⋯Cl−⋯O−⋯Cl
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Answer

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Step 1:
I'll solve this Lewis structure problem step by step:

Step 2:
: Determine the total number of valence electrons

- Total valence electrons: $$6 + (7 \times 2) = 20$$ electrons
- Oxygen (O): 6 valence electrons - Chlorine (Cl): 7 valence electrons × 2

Step 3:
: Arrange atoms and connect with single bonds

- Initial electron distribution: $$\frac{20}{2} = 10$$ electron pairs
- Place O in the center - Connect two Cl atoms to O with single bonds

Step 4:
: Complete octets for outer atoms (Cl)

- Each Cl needs 8 electrons - Place 3 electron pairs around each Cl atom

Step 5:
: Distribute remaining electrons to central O

- Remaining electrons: $$20 - (3 \times 2 \times 2) = 14$$ electrons
- Place remaining electrons on O to complete its octet

Step 6:
: Analyze the Lewis structures

- Option A and C are identical - Option B shows a different electron arrangement

Step 7:
: Determine the most stable structure

- Option B (⋯Cl−:O−⋯Cl) provides the most stable electron configuration - Electrons are distributed to minimize formal charges - Central O has a complete octet - Cl atoms have complete octets

Final Answer

B (⋯Cl−:O−⋯Cl) is the best Lewis structure for OCl^2.