Match the Column I with column II and mark the appropriate choice.
`{:("Column I","Column II"),((A) "Coal gas",(i)CO + H_(2)),((B )"Synthesis gas",(ii) CH_(4)),((C )"Producer gas",(iii) H_(2) + CH_(4) + CO),((D) "Natural gas",(iv) CO + N_(2)):}`

Options

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

Answer

To solve the matching question, we will analyze each gas listed in Column I and identify its chemical composition from Column II.

### Step-by-Step Solution:

1. **Identify Coal Gas:**
- Coal gas is primarily composed of hydrogen (H₂), methane (CH₄), and carbon monoxide (CO).
- Therefore, it matches with option (iii) H₂ + CH₄ + CO.

2. **Identify Synthesis Gas:**
- Synthesis gas, also known as water gas, is a mixture of carbon monoxide (CO) and hydrogen (H₂).
- Thus, it matches with option (i) CO + H₂.

3. **Identify Producer Gas:**
- Producer gas is a mixture of carbon monoxide (CO) and nitrogen (N₂).
- Hence, it corresponds to option (iv) CO + N₂.

4. **Identify Natural Gas:**
- Natural gas is primarily composed of methane (CH₄).
- Therefore, it matches with option (ii) CH₄.

### Final Matching:
- (A) Coal gas → (iii) H₂ + CH₄ + CO
- (B) Synthesis gas → (i) CO + H₂
- (C) Producer gas → (iv) CO + N₂
- (D) Natural gas → (ii) CH₄

### Summary of Matches:
- A - iii
- B - i
- C - iv
- D - ii