Among the following compounds which one will produce a Schiff base on reaction with cyclopentanone?

Options

A.
B.
C.
D.

Explanation

To determine which compound will produce a Schiff base upon reaction with cyclopentanone, we need to follow these steps:

### Step 1: Understand the Concept of Schiff Base
A Schiff base is formed when a primary amine reacts with a carbonyl compound (like a ketone or aldehyde). The general reaction involves the nucleophilic attack of the amine on the carbonyl carbon, followed by the loss of water.

### Step 2: Identify the Reactants
In this case, we are reacting cyclopentanone (a ketone) with a primary amine. Cyclopentanone has the structure:

```
O
//
C-C
| |
C-C
```

### Step 3: Determine the Type of Amines
We need to identify which of the given compounds is a primary amine. A primary amine has the structure R-NH2, where R is an alkyl or aryl group.

### Step 4: Analyze Each Compound
- **Option A**: If it has two carbon groups attached to nitrogen (R1 and R2), it is a secondary amine.
- **Option B**: If it has one carbon group and one hydrogen attached to nitrogen, it is a primary amine.
- **Option C**: If it has two carbon groups attached to nitrogen, it is a secondary amine.
- **Option D**: If it has three carbon groups attached to nitrogen, it is a tertiary amine.

### Step 5: Identify the Primary Amine
From the analysis, we find that only **Option B** has the structure of a primary amine (R-NH2).

### Step 6: Confirm the Reaction
Now, we can confirm that when cyclopentanone reacts with this primary amine, it will form a Schiff base. The reaction proceeds as follows:
1. The nitrogen of the primary amine attacks the carbonyl carbon of cyclopentanone.
2. A tetrahedral intermediate is formed.
3. Water is eliminated, resulting in the formation of the Schiff base.

### Conclusion
Thus, the compound that will produce a Schiff base on reaction with cyclopentanone is **Option B**.

---