Assertionj: The following structures (I) and (II) canot e the major contributors to the real structure of `CH_(3)COOCH_(3)`
`CH_(3)-underset(I)underset(+)overset( : overset(..)(C)^(-): )overset(|)(C)-underset(..)overset(..)(O)harrunderset(II)(CH_(3)-overset( : overset(..)(O)^(-): )overset(|)(C)=underset(..)overset(+)(O)-CH_(3))`
Reason: Both the structures involve charge separation and structure (I) contains a carbon atom with an incomplete octet.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

To solve the question, we will analyze both the assertion and the reason provided, and determine their validity in the context of the structures of methyl acetate (CH₃COOCH₃).

### Step 1: Understanding the Structures
The question presents two structures (I) and (II) as potential resonance contributors for methyl acetate. We need to analyze these structures to see if they can be major contributors.

**Structure I:**
- This structure has a positive charge on a carbon atom and a negative charge on an adjacent carbon atom.
- A carbon atom with a positive charge typically has an incomplete octet, which makes it less stable.

**Structure II:**
- This structure has a positive charge on the oxygen atom and a negative charge on the adjacent carbon atom.
- While oxygen can accommodate a positive charge, it is electronegative and prefers to hold onto its electrons.

### Step 2: Evaluating the Assertion
The assertion states that structures I and II cannot be the major contributors to the real structure of methyl acetate.

- **Analysis:**
- Structure I has a carbon with an incomplete octet, which is not favorable.
- Structure II has charge separation, which also destabilizes the molecule.

Thus, the assertion is **correct** because both structures are not favorable contributors due to charge separation and the incomplete octet in structure I.

### Step 3: Evaluating the Reason
The reason states that both structures involve charge separation and that structure I contains a carbon atom with an incomplete octet.

- **Analysis:**
- Both structures indeed involve charge separation.
- Structure I does have a carbon atom with an incomplete octet, which makes it less stable.

Therefore, the reason is also **correct** and it correctly explains why the assertion is true.

### Step 4: Conclusion
Since both the assertion and reason are correct, and the reason explains the assertion, we conclude that:

- **Assertion:** True
- **Reason:** True and explains the assertion.

Thus, the answer to the question is that both statements are correct, but the assertion stands alone as the primary conclusion.

### Final Answer:
**Assertion is correct, Reason is correct and explains the Assertion.**

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