Reductive amination of aldehydes or ketones done with `NH_3` yields product (A ) which when dehydrated gives (B ) . Which of these is mostly likely product (B ) ?

Options

A. Imine
B. Amide
C. Cyanide
D. Alcohol

Answer

To solve the problem of identifying product (B) from the reductive amination of aldehydes or ketones with ammonia (NH₃), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Reductive Amination**:
- Reductive amination is a reaction where an aldehyde or ketone reacts with ammonia or an amine to form an amine. In this case, we are using ammonia (NH₃).

2. **Reaction with Aldehyde or Ketone**:
- When an aldehyde (RCHO) or a ketone (RCOR') reacts with ammonia, it forms an intermediate imine (RCH=NH₂) after the removal of water (dehydration).

3. **Formation of Product (A)**:
- The product (A) formed from the reaction of the aldehyde or ketone with ammonia is a primary amine (RCH₂NH₂). This is because the carbonyl compound (C=O) is converted into an imine (C=N) and then reduced to an amine.

4. **Dehydration to Form Product (B)**:
- When product (A) undergoes dehydration, it loses a molecule of water (H₂O) and forms an imine (RCH=NH). This imine is the product (B).

5. **Identifying Product (B)**:
- The final product (B) after dehydration is an imine, which can be represented as RCH=NH. This is a characteristic product of the dehydration of the amine formed from the reductive amination process.

### Conclusion:
Thus, the most likely product (B) is an imine, which can be referred to as an "imine" or "C=N" compound.