Assetion(A): Acetylene on additional polymerization gives benzene.
Reason(R): The empirical formulae of acetylene and benzene are same
The correct answer is

Options

A. Both A and R are true and R is the correct explanation of (A)
B. Both A and R are true and R is not the correct explanation of A.
C. A is true but R is false
D. A is false but R is true

Answer

To solve the assertion and reason question, we will analyze both the assertion (A) and the reason (R) step by step.

### Step 1: Analyze the Assertion (A)
The assertion states: "Acetylene on additional polymerization gives benzene."

- Acetylene (C₂H₂) can undergo a process called additional polymerization.
- In this process, multiple acetylene molecules combine to form a larger molecule, which in this case is benzene (C₆H₆).
- The reaction can be represented as:
\[ 3 \text{C}_2\text{H}_2 \rightarrow \text{C}_6\text{H}_6 \]
- Therefore, the assertion is **true**.

### Step 2: Analyze the Reason (R)
The reason states: "The empirical formulae of acetylene and benzene are the same."

- The empirical formula of a compound is the simplest whole-number ratio of the elements in that compound.
- For acetylene (C₂H₂), the empirical formula is:
\[ \text{C}_1\text{H}_1 \quad (\text{or simply } \text{CH}) \]
- For benzene (C₆H₆), the empirical formula is also:
\[ \text{C}_1\text{H}_1 \quad (\text{or simply } \text{CH}) \]
- Since both compounds have the same empirical formula (CH), the reason is also **true**.

### Step 3: Determine the Relationship Between A and R
- The assertion (A) is true because acetylene can indeed polymerize to form benzene.
- The reason (R) is true because both acetylene and benzene share the same empirical formula.
- However, the reason (R) does not explain why the assertion (A) is true. The fact that they have the same empirical formula does not imply that acetylene polymerizes to form benzene.

### Conclusion
- Both A and R are true, but R is not the correct explanation of A.

### Final Answer
The correct answer is: Both A and R are true, but R is not the correct explanation of A.

---