Consider following compounds,
(i) `H_(3)X-HCS` (ii)`H_(3)Y-NCS` (iii)`(H_(3)Y)_(2)O` (iv)`(H_(2)X)_(2)O`
The incorrect statement regarding given compounds is :

Options

A. If Y is carbon in compounds (ii) and (iv), then both are bent
B. If X is silicon in compounds (i) and (iii), then both are linear
C. If X is carbon and Y is silicon, the compound (i) is more basic than compound (ii)
D. If X is silicon and Y is carbon, then X-O-X bond angle compounds (iii) is greater than Y-O-Y bond angle in compounds (iv)

Explanation

To determine the incorrect statement regarding the given compounds, we will analyze each compound and the statements provided.

### Step 1: Identify the Compounds
The compounds given are:
1. \( H_3X - HCS \)
2. \( H_3Y - NCS \)
3. \( (H_3Y)_2O \)
4. \( (H_2X)_2O \)

### Step 2: Analyze Each Statement
We need to analyze the statements regarding the elements X and Y in the compounds.

#### Statement Analysis:
1. **Statement 1:** Y is carbon in compound 1.
- If Y is carbon, then \( H_3Y \) would be \( H_3C \), and \( HCS \) would imply a structure with carbon and sulfur. This statement is plausible.

2. **Statement 2:** X is silicon in compound 1.
- If X is silicon, then \( H_3X \) would be \( H_3Si \). This compound can form a linear structure with \( HCS \). This statement is also plausible.

3. **Statement 3:** If X is carbon and Y is silicon, compound 1 is more basic than compound 2.
- If X is carbon and Y is silicon, then \( H_3C - HCS \) and \( H_3Si - NCS \) are compared. Basicity generally decreases down the group in the periodic table, making this statement likely incorrect.

4. **Statement 4:** If X is silicon and Y is carbon, then the bond angle \( X-O-X \) is greater than \( X-O-Y \).
- If X is silicon and Y is carbon, both compounds would have similar bond angles due to their linear structure. This statement is also likely incorrect.

### Step 3: Conclusion
From the analysis, the incorrect statement is:
- **Statement 3:** If X is carbon and Y is silicon, compound 1 is more basic than compound 2.

### Final Answer
The incorrect statement regarding the given compounds is **Statement 3**.

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