`C_(6)H_(5)CHO overset(NH_(2)OH)(rarr)" A " overset(H_(2)O)(rarr)` B
What is not true for the compound B –

Options

A. Gives cannizaro’s reaction
B. Acts as strong reducing agent
C. Gives phenol on reduction
D. Gives optical active compound with HCN

Answer

To solve the problem, we need to analyze the reactions of the compound C₆H₅CHO (benzaldehyde) and determine the properties of the resulting compound B after the reactions. Let's break it down step by step.

### Step 1: Identify the Initial Compound
The initial compound is C₆H₅CHO, which is benzaldehyde. It is a carbonyl compound and does not have any alpha-hydrogens.

### Step 2: Reaction with Hydroxylamine (NH₂OH)
When benzaldehyde reacts with hydroxylamine (NH₂OH), a nucleophilic addition reaction occurs. The nitrogen from hydroxylamine attacks the carbonyl carbon, leading to the formation of an oxime.

**Reaction:**
C₆H₅CHO + NH₂OH → C₆H₅CH=NOH (Oxime)

This product is referred to as compound A.

### Step 3: Hydrolysis of Compound A
Next, we perform hydrolysis on the oxime (compound A) using water (H₂O). Hydrolysis will convert the oxime back to the original aldehyde.

**Reaction:**
C₆H₅CH=NOH + H₂O → C₆H₅CHO

Thus, compound B is again benzaldehyde (C₆H₅CHO).

### Step 4: Analyze Properties of Compound B
Now we need to evaluate the statements regarding compound B (benzaldehyde) and identify which statement is not true.

1. **Gibbs-Canizzaro Reaction:**
- Benzaldehyde does not have alpha-hydrogens, so it can undergo the Canizzaro reaction. This statement is true.

2. **Acts as a Strong Reducing Agent:**
- In the Canizzaro reaction, one molecule of benzaldehyde is oxidized while another is reduced. Therefore, it can act as a reducing agent. This statement is true.

3. **Gives Phenol on Reduction:**
- When benzaldehyde is reduced, it forms benzyl alcohol (C₆H₅CH₂OH), not phenol (C₆H₅OH). This statement is not true.

4. **Gives Optical Active Compound with HCN:**
- When benzaldehyde reacts with HCN, it forms a cyanohydrin, which has a chiral carbon and can be optically active. This statement is true.

### Conclusion
The statement that is not true regarding compound B (benzaldehyde) is that it gives phenol on reduction.

### Final Answer
The statement that is not true for compound B is: "Gives phenol on reduction."

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