Assertion: When two gaseous OF molecules are allowed to cool, then they undergo dimerisation through O-atom.
Reason: Dimerr form of OF molecule (i.e, `O_(2)F_(2)`) is having one peroxy linkage in its structure.

Options

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

Answer

To analyze the assertion and reason provided in the question, we will break down the concepts step by step.

### Step 1: Understanding the Assertion
The assertion states that when two gaseous OF (oxygen difluoride) molecules are cooled, they undergo dimerization through the oxygen atom.

- **Explanation**: Oxygen difluoride (OF) has a structure where the oxygen atom has one unpaired electron. When two OF molecules come close to each other, the unpaired electrons on the oxygen atoms can pair up, leading to the formation of a dimer, which is O2F2.

### Step 2: Understanding the Reason
The reason states that the dimer form of OF, which is O2F2, has one peroxy linkage in its structure.

- **Explanation**: A peroxy linkage (or peroxy bond) is characterized by the presence of an O-O bond where both oxygen atoms are in a -1 oxidation state, as seen in hydrogen peroxide (H2O2). In O2F2, the oxidation states of the oxygen atoms are +1, which means that the structure does not contain a peroxy linkage.

### Step 3: Conclusion
- The assertion is correct because dimerization of OF does occur through the oxygen atom.
- The reason is incorrect because O2F2 does not have a peroxy linkage; instead, the oxidation states of the oxygen atoms are +1.

### Final Answer
Thus, the correct conclusion is that the assertion is true, but the reason is false.