In the reaction sequence `C_(6)H_(5)-underset(O)underset(||)C-CH_(3)overset(NH_(2)OH//overset(o+)H)rarr(A)overset(P_(2)O_(5))rarr [X]`
[X] will be

Options

A. `{:(C_(6)H_(5)-C-CH_(3)),(" ||"),(" "N-OH):}`
B. `CH_(3)COOH`
C. `C_(6)H_(5)-NH_(2)`
D. `CH_(3)-CO-NH-C_(6)H_(5)`

Answer

To solve the given reaction sequence, we need to analyze each step carefully. The initial compound is a phenyl ketone, and we are reacting it with hydroxylamine (NH2OH) followed by an acid and then phosphorus pentoxide (P2O5). Let's break it down step by step.

### Step 1: Identify the Initial Compound
The initial compound is `C6H5-CO-CH3`, which is acetophenone (phenyl methyl ketone).

### Step 2: Reaction with Hydroxylamine
When acetophenone reacts with hydroxylamine (NH2OH), it forms an oxime. The reaction can be represented as follows:
- **Reaction**:
\[ C6H5-CO-CH3 + NH2OH \rightarrow C6H5-C(=NOH)-CH3 + H2O \]
- **Product**: The product is an oxime, `C6H5-C(=NOH)-CH3`.

### Step 3: Protonation of the Oxime
Next, the oxime is treated with an acid (H+). The hydroxyl group (OH) of the oxime gets protonated, making it a better leaving group:
- **Reaction**:
\[ C6H5-C(=NOH)-CH3 + H^+ \rightarrow C6H5-C(=N^+OH)-CH3 \]
- **Intermediate**: This leads to a positively charged intermediate.

### Step 4: Elimination of Water
In the presence of the acid, the oxime can undergo dehydration (loss of water), leading to the formation of an imine:
- **Reaction**:
\[ C6H5-C(=N^+OH)-CH3 \rightarrow C6H5-C(=N)-CH3 + H2O \]
- **Product**: The product is an imine, `C6H5-C(=N)-CH3`.

### Step 5: Reaction with P2O5
Finally, when the imine is treated with phosphorus pentoxide (P2O5), which is a dehydrating agent, it will not further change the structure significantly because the imine is already dehydrated:
- **Reaction**:
\[ C6H5-C(=N)-CH3 + P2O5 \rightarrow C6H5-C(=N)-CH3 \]
- **Final Product**: The final product remains the same, which is `C6H5-C(=N)-CH3`.

### Conclusion
Thus, the final product [X] after the entire reaction sequence is:
\[ \text{[X] = } C6H5-C(=N)-CH3 \]