Assertion: F-F bond in `F_2` is stronger than Cl-Cl bond in `Cl_2`
Reason: F atom is small in size than.

Options

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

Answer

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

### Step 1: Understand the Assertion
The assertion states that the F-F bond in F₂ is stronger than the Cl-Cl bond in Cl₂.

**Hint:** Think about the bond strength in diatomic molecules and how atomic size affects it.

### Step 2: Analyze the Bond Strength
In general, bond strength can be influenced by several factors, including atomic size and the number of electron pairs involved in bonding.

**Hint:** Consider how atomic size and electron repulsion might affect bond strength.

### Step 3: Consider Atomic Size
Fluorine (F) is smaller in size compared to chlorine (Cl). The smaller atomic size of fluorine leads to greater electron-electron repulsion between the lone pairs of electrons on the two fluorine atoms when they bond.

**Hint:** Recall how electron repulsion can weaken a bond.

### Step 4: Compare the Bonds
In F₂, the bond is weakened due to the high repulsion between the lone pairs of electrons on the small fluorine atoms. In contrast, chlorine atoms are larger, which results in less repulsion between the bond pairs and lone pairs.

**Hint:** Think about how the size of the atoms influences the distance between the electrons and how that affects repulsion.

### Step 5: Conclusion on Assertion
Since the F-F bond is weakened due to electron repulsion, the assertion that the F-F bond is stronger than the Cl-Cl bond is incorrect.

**Hint:** Remember that stronger bonds typically have less repulsion and more effective overlap of atomic orbitals.

### Step 6: Evaluate the Reason
The reason states that the F atom is smaller in size than Cl. This statement is true. However, while the reason is correct, it does not support the assertion.

**Hint:** Determine if the reason logically connects to the assertion.

### Final Conclusion
- The assertion is **false**: The F-F bond in F₂ is **not stronger** than the Cl-Cl bond in Cl₂.
- The reason is **true**: The F atom is indeed smaller than the Cl atom, but this leads to weaker bonding in F₂ due to increased repulsion.

### Final Answer
The assertion is false, and the reason is true.