The following conversion is/are possible by
`Ph-CH_(2)-CH=O to overset("(Phenyl alanine)")(Ph-CH_(3)-underset(NH_(3))underset(|)(C)H-COOH)`

Options

A. `overset(KCN//H_(2)O)to overset(NH_(3),Delta)to overset(H_(3)O^(o+),Delta)to`
B. `overset(KCN//NH_(4)Cl)to overset(H_(3)O^(o+),Delta)to`
C. `overset(HCN//NaOH)to overset(SOCl_(2))to overset(NH_(3))to overset(H_(3)O^(o+),Delta)to`
D. `overset(Br_(2)//CH_(3)COOH)to overset(NH_(3))to overset(CrO_(3)//H^(o+))to`

Explanation

To convert the compound Ph-CH₂-CH=O to phenylalanine (Ph-CH(CH₃)-COOH-NH₂), we can follow these steps:

### Step 1: Nucleophilic Addition of Cyanide
The first step involves the nucleophilic addition of cyanide to the carbonyl group of the aldehyde. We can use potassium cyanide (KCN) in the presence of water (H₂O) for this reaction.

**Reaction:**
\[ \text{Ph-CH}_2\text{-CH=O} + \text{KCN} \rightarrow \text{Ph-CH}_2\text{-CH(CN)} \]

### Step 2: Formation of an Amino Group
In the next step, we treat the intermediate product with ammonia (NH₃). This will lead to the addition of an amino group to the carbon that is bonded to the cyanide.

**Reaction:**
\[ \text{Ph-CH}_2\text{-CH(CN)} + \text{NH}_3 \rightarrow \text{Ph-CH}_2\text{-CH(CN)(NH}_2) \]

### Step 3: Hydrolysis of Nitrile
Now, we need to hydrolyze the nitrile group (CN) to a carboxylic acid (COOH). This can be achieved by treating the product with an acid (like H₃O⁺).

**Reaction:**
\[ \text{Ph-CH}_2\text{-CH(CN)(NH}_2) + \text{H}_3\text{O}^+ \rightarrow \text{Ph-CH}_2\text{-CH(COOH)(NH}_2) \]

### Final Product
The final product after hydrolysis is phenylalanine:
\[ \text{Ph-CH}_2\text{-CH(COOH)(NH}_2) \]

### Summary of Reagents
- **KCN**: Used for the nucleophilic addition to the carbonyl group.
- **NH₃**: Used to introduce the amino group.
- **H₃O⁺**: Used for hydrolysis of the nitrile to form the carboxylic acid.

### Conclusion
The conversion of Ph-CH₂-CH=O to phenylalanine is possible using the reagents KCN, NH₃, and H₃O⁺.

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