Match the Column I with Column II and mark the approprite choice.
`{:("Column I","Column II"),((A)"Galena",(i)"Abrasive"),((B)"Diamond",(ii)"Metal carbonyls"),((C )"Carbon monoxide",(iii) "Hydrides of Si"),((D) "Silanes",(iv) "An ore of lead"):}`

Options

A. (A) `to` (iv), (B) `to` (ii), (C ) `to` (i), (D) `to` (iii)
B. (A) `to` (iv), (B) `to` (i), (C ) `to` (ii), (D) `to` (iii)
C. (A) `to` (ii), (B) `to` (i), (C ) `to` (iii), (D) `to` (iv)
D. (A) `to` (i), (B) `to` (ii), (C ) `to` (iii), (D) `to` (iv)

Answer

To solve the matching question, we need to pair items from Column I with their corresponding descriptions in Column II. Let's analyze each item step by step.

### Step-by-Step Solution:

1. **Identify Galena**:
- Galena is known as an ore of lead. Its chemical formula is PbS (lead sulfide).
- **Match**: Galena (A) matches with (iv) "An ore of lead".

2. **Identify Diamond**:
- Diamond is a form of carbon and is recognized as one of the hardest materials. It is commonly used in cutting tools and jewelry due to its hardness.
- **Match**: Diamond (B) matches with (i) "Abrasive".

3. **Identify Carbon Monoxide**:
- Carbon monoxide (CO) has a tendency to form metal carbonyls. This is due to its ability to donate a lone pair of electrons to transition metals, forming complexes known as metal carbonyls.
- **Match**: Carbon monoxide (C) matches with (ii) "Metal carbonyls".

4. **Identify Silanes**:
- Silanes are compounds that contain silicon and hydrogen. They are known as the hydrides of silicon.
- **Match**: Silanes (D) matches with (iii) "Hydrides of Si".

### Final Matches:
- A → (iv) "An ore of lead"
- B → (i) "Abrasive"
- C → (ii) "Metal carbonyls"
- D → (iii) "Hydrides of Si"

### Conclusion:
Thus, the correct order is:
- A: iv
- B: i
- C: ii
- D: iii

The correct option is **B**.