In which of the following first resonating structure is more stable than the second?

Options

A. `overset(Theta)(CH_(2))-CH=OharrCH_(2)=CH-O^(Theta)`
B. `overset(o+)(CH_(2))-O-CH_(3)harrCH_(2)=overset(o+)(O)-CH_(3)`
C. `CH_(2)=CH-NH_(2)harroverset(Theta)(CH_(2))-CH=overset(o+)(NH_(2))`
D. `overset(o+)(O)-CH=CH_(2)harrO=CH=overset(o+)(CH_(2))`

Answer

To determine in which of the given options the first resonating structure is more stable than the second, we need to analyze the stability of the resonating structures based on the placement of charges and the electronegativity of the atoms involved.

### Step-by-Step Solution:

1. **Identify the Resonating Structures**:
- For each option (A, B, C, D), identify the first and second resonating structures.

2. **Analyze Charge Distribution**:
- Check where the charges (positive or negative) are located in each structure.
- Remember that a negative charge is more stable on a more electronegative atom (like O or N), while a positive charge is more stable on less electronegative atoms (like C).

3. **Evaluate Each Option**:
- **Option A**: Compare the charges in the first and second structures. If the first structure has a negative charge on a less electronegative atom (like C), and the second has it on a more electronegative atom (like O), the second structure is more stable.
- **Option B**: If the first structure has a positive charge on a less electronegative atom (like C) and the second has it on a more electronegative atom (like O), the first structure is more stable.
- **Option C**: Similar analysis as above. If the first structure has a positive charge on a less electronegative atom and the second has it on a more electronegative atom, the first structure is more stable.
- **Option D**: If the first structure has a positive charge and the second has a negative charge on a more electronegative atom, the second structure is more stable.

4. **Conclusion**:
- After evaluating all options, identify which options have the first resonating structure being more stable than the second. According to the analysis, options B and C are where the first resonating structure is more stable than the second.

### Final Answer:
The first resonating structure is more stable than the second in options **B and C**.