In the following questions, a statement of assertion (A) is following by a statement of reason (R )
A : Chlorobenzene on reaction with sodium metal in the presence of dry ether gives diphenyl.
R: This reaction is called UIImann reaction.

Options

A. If both Assertion & Reason are the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark(2).
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion (A)**: The assertion states that chlorobenzene reacts with sodium metal in the presence of dry ether to produce diphenyl. This reaction is indeed correct. When chlorobenzene is treated with sodium in dry ether, it undergoes a coupling reaction leading to the formation of diphenyl.

2. **Chemical Reaction**: The reaction can be represented as follows:
\[ 2 \text{C}_6\text{H}_5\text{Cl} + 2 \text{Na} \xrightarrow{\text{dry ether}} \text{C}_{12}\text{H}_{10} + 2 \text{NaCl} \]
Here, two molecules of chlorobenzene (C₆H₅Cl) react with sodium (Na) to form diphenyl (C₁₂H₁₀) and sodium chloride (NaCl).

3. **Understanding the Reason (R)**: The reason states that this reaction is called the Ullmann reaction. However, this is incorrect. The reaction described is actually known as the Fittig reaction, not the Ullmann reaction. The Ullmann reaction involves the coupling of aryl halides in the presence of a copper catalyst, which is not the case here.

4. **Conclusion**: Since the assertion is true (chlorobenzene does give diphenyl with sodium in dry ether), but the reason is false (it is not called the Ullmann reaction, but rather the Fittig reaction), we conclude that the correct relationship is that the assertion is true, and the reason is false.

5. **Final Answer**: Therefore, the correct option is that the assertion is true, but the reason is false.

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