Point out the incorrect statement among the following?

Options

A. The oxidation state of oxygen is `+2` in `OF_(2)`.
B. Acidic character follows the order `H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te.`
C. The tendency to form multiple bonds increases in moving down the group from sulphur to tellurium (towards C and N)
D. Sulphur has a strong tendency to catenate while oxygen shows this tendency to a limited extent.

Answer

To solve the question of identifying the incorrect statement, let's analyze each statement step by step:

### Step 1: Analyze the first statement
**Statement:** The oxidation state of oxygen is +2 in OF2.

- In OF2, fluorine (F) has an oxidation state of -1.
- Let the oxidation state of oxygen be \( x \).
- The equation for the oxidation states is:
\[ x + 2(-1) = 0 \]
\[ x - 2 = 0 \implies x = +2 \]
- **Conclusion:** This statement is correct.

### Step 2: Analyze the second statement
**Statement:** The acidic character follows the order H2O, H2S, H2Se, H2Te.

- As we move down the group from oxygen to tellurium, the size of the central atom increases, which results in weaker H-X bonds (where X is the central atom).
- Weaker bonds are easier to break, leading to increased acidic character.
- **Conclusion:** This statement is correct.

### Step 3: Analyze the third statement
**Statement:** The tendency to form multiple bonds increases when moving down the group from sulfur to tellurium.

- As we move down the group, the size of the atoms increases, leading to poorer overlap of p-orbitals.
- This poor overlap makes it difficult to form multiple bonds (like p-pi-p-pi bonds).
- Therefore, the tendency to form multiple bonds actually decreases down the group.
- **Conclusion:** This statement is incorrect.

### Step 4: Analyze the fourth statement
**Statement:** Sulfur has a strong tendency to catenate while oxygen shows this tendency to a limited extent.

- Catenation refers to the ability of an element to form chains of atoms of the same element.
- Oxygen, being small, experiences significant lone pair-lone pair repulsion, limiting its ability to catenate.
- Sulfur, on the other hand, can catenate due to its larger size, allowing for more stable structures like S6 and S8.
- **Conclusion:** This statement is correct.

### Final Answer
The incorrect statement among the options is the third statement: "The tendency to form multiple bonds increases when moving down the group from sulfur to tellurium."

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