An aromatic compound X with molecular formula `C_(9)H_(10)O` gives following chemical tests:
(i) Form 2,4-DNP derivative
(ii) Reduces Tollen's reagent
(iii) undergoes Cannizzaro's reaction
(iv) On vigorous oxidation 1, 2-Benzene dicarboxylic acid is obtained
The compound X is ,

Options

A.
B.
C.
D.

Answer

To solve the problem, we need to analyze the given information about the aromatic compound X with the molecular formula C9H10O and the results of its chemical tests.

### Step-by-Step Solution:

1. **Identify the Molecular Formula**:
The compound has a molecular formula of C9H10O. This indicates that it is an aromatic compound since it contains a benzene ring.

**Hint**: Look for the presence of a benzene ring in the structure based on the molecular formula.

2. **Chemical Tests Analysis**:
- **Test (i)**: The compound forms a 2,4-DNP derivative. This indicates that the compound contains a carbonyl group (C=O), which is characteristic of aldehydes and ketones.
- **Test (ii)**: The compound reduces Tollen's reagent. This is a specific test for aldehydes, confirming that the compound is likely an aldehyde.
- **Test (iii)**: The compound undergoes Cannizzaro's reaction. This reaction occurs with aldehydes that do not have alpha-hydrogens, indicating that the carbonyl group is directly attached to the benzene ring.
- **Test (iv)**: On vigorous oxidation, the compound yields 1,2-benzene dicarboxylic acid. This suggests that the compound is ortho-substituted, as only ortho-substituted benzaldehydes can give this product upon oxidation.

**Hint**: Each test provides clues about the functional groups and structure of the compound. Pay attention to the implications of each test.

3. **Determine the Structure**:
Given that the compound is an aldehyde (from tests i and ii) and undergoes Cannizzaro's reaction (test iii), we can conclude that the carbonyl group (CHO) is directly attached to the benzene ring.

Since the oxidation leads to 1,2-benzene dicarboxylic acid, the compound must be an ortho-substituted benzaldehyde.

**Hint**: Consider the structural implications of being ortho-substituted when determining the final structure.

4. **Count the Carbons**:
The molecular formula C9H10O indicates:
- 6 carbons in the benzene ring
- 1 carbon in the carbonyl group (CHO)
- This leaves 2 carbons, which must be part of an ethyl group (C2H5).

Therefore, the structure of the compound can be deduced as 2-ethylbenzaldehyde.

**Hint**: Use the molecular formula to deduce the number of substituents and their positions.

5. **Final Structure**:
The final structure of compound X is 2-ethylbenzaldehyde, which can be represented as follows:
- A benzene ring with an ethyl group (C2H5) at the ortho position relative to the carbonyl group (CHO).

**Hint**: Visualize the structure to confirm the placement of the substituents based on the deductions made.

### Conclusion:
The compound X is 2-ethylbenzaldehyde (C9H10O).