The most stable resonating structure of `CH_(3)-underset(* *)overset(* *)O=CH` is :

Options

A. `CH_(3)-underset(* *)overset(* *)O-overset(o+)CH_(2)`
B. `CH_(3)-overset(o+)O=CH-overset(Ɵ)CH_(2)`
C. `CH_(3)-underset(* *)overset(* *)O=CH-overset(o+)CH_(2)`
D. `CH_(3)-O-overset(o+)CH-overset(Ɵ)CH_(2)`

Explanation

To determine the most stable resonating structure of the compound `CH₃-CHO`, we will analyze the given options based on stability rules for resonance structures.

### Step-by-Step Solution:

1. **Identify the Resonance Structures**:
- The compound `CH₃-CHO` can have multiple resonance structures. We need to visualize the possible structures where the double bond and charges can be rearranged.

2. **Count the Charges**:
- The first rule of resonance stability is to minimize the number of charges. We will evaluate each option based on the number of formal charges present.
- For example, if one structure has no charges and another has two charges, the one with no charges is more stable.

3. **Evaluate Charge Distribution**:
- The second rule is to maximize the number of covalent bonds (or minimize the number of lone pairs). Structures with more bonds (especially double bonds) are generally more stable.
- Check if any of the structures have more than 5 bonds or if they have a good distribution of charges.

4. **Analyze Charge Location**:
- The third rule involves the location of charges. Negative charges should ideally be on more electronegative atoms, and positive charges on less electronegative atoms.
- Evaluate the electronegativity of atoms in each structure and see if the charges are placed accordingly.

5. **Consider Charge Separation**:
- The fourth rule is that structures with less charge separation are generally more stable. If charges are too far apart, it can lead to instability.
- Look for structures where opposite charges are close together, as they will experience attractive forces.

6. **Select the Most Stable Structure**:
- After evaluating all the options based on the above rules, select the structure that adheres to the maximum number of stability rules.
- In this case, based on our analysis, option C is determined to be the most stable resonating structure.

### Final Answer:
The most stable resonating structure of `CH₃-CHO` is **Option C**.