The modified form of adenine is

Options

A. A)2,4 - Dichlorophenoxy acetic acid
B. B)N6 - furfuryl amino purine
C. C)2-chloro ethyl phosphonic acid
D. D)Dichloro phenyl methyl urea

Answer

To solve the question regarding the modified form of adenine, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Question**: The question asks for the modified form of adenine.

2. **Recall Relevant Information**: Adenine is a nucleobase that is part of DNA and RNA. It can undergo modifications to form different compounds.

3. **Research Historical Context**: The modified form of adenine was discovered by two scientists, Carlos Miller and Fox Cook, in 1955.

4. **Identify the Modified Form**: The modified form of adenine that is relevant in this context is known as "Kinetin."

5. **Understand the Function of Kinetin**: Kinetin is a type of cytokinin, which is a plant hormone that promotes cell division and growth in plants.

6. **Chemical Name of Kinetin**: The chemical name of Kinetin is N6-furfurylaminopurine.

7. **Evaluate the Options**: Given the options, we need to identify which one corresponds to Kinetin. The correct option is N6-furfurylaminopurine.

8. **Conclude the Answer**: Therefore, the modified form of adenine is Kinetin, and its chemical name is N6-furfurylaminopurine.

### Final Answer:
The modified form of adenine is Kinetin (N6-furfurylaminopurine).

---