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 among the provided options, we will analyze each statement step by step.

### Step 1: Analyze the first statement about the oxidation state of fluorine in OF2.

- **Given Statement**: The oxidation state of fluorine in OF2 is +2.
- **Analysis**: In OF2, oxygen is more electronegative than fluorine. The oxidation state of fluorine is -1. To find the oxidation state of oxygen (let's denote it as x), we set up the equation:

\[ x + 2(-1) = 0 \implies x - 2 = 0 \implies x = +2 \]

- **Conclusion**: The statement is correct. The oxidation state of fluorine in OF2 is indeed -1, while the oxidation state of oxygen is +2.

### Step 2: Analyze the second statement regarding the acidic character down the group.

- **Given Statement**: The acidic character increases when going down the group.
- **Analysis**: As we move down a group in the periodic table, the size of the atoms increases due to the addition of electron shells. This leads to a decrease in bond strength, making it easier for the compound to release H+ ions, thus increasing acidity.

- **Conclusion**: This statement is correct. The acidic character does increase down the group.

### Step 3: Analyze the third statement about the tendency to form multiple bonds.

- **Given Statement**: The tendency to form multiple bonds increases when moving down the group from sulfur to tellurium.
- **Analysis**: As we move down the group, the atomic size increases, which leads to poorer overlap of p-orbitals. This reduced overlap decreases the ability to form multiple bonds (like double or triple bonds).

- **Conclusion**: This statement is incorrect. The tendency to form multiple bonds actually decreases down the group due to poor orbital overlap.

### Step 4: Analyze the fourth statement about catenation.

- **Given Statement**: The tendency to catenate for sulfur is greater than that for oxygen.
- **Analysis**: Catenation refers to the ability of an element to form chains with itself. Sulfur can catenate more effectively than oxygen due to its larger atomic size, which reduces repulsion between sulfur-sulfur bonds compared to the strong repulsion in oxygen-oxygen bonds.

- **Conclusion**: This statement is correct. Sulfur has a greater tendency to catenate than oxygen.

### Final Conclusion:
The incorrect statement among the options provided is the third statement regarding the tendency to form multiple bonds, which decreases down the group from sulfur to tellurium.

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