Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options (a), (b), ( c ), (d) given at the end of each question.
`{:(,,"Column I (Reaction)",,,,,,"Column II (Order)"),((A),,2" HI"to H_(2)+I_(2),,,,(p),,0),((B),,2" NH"_(3)to N_(2)+3" H"_(2),,,,(q),,1),((C),,2" H"_(2)"O"_(2)to 2" H"_(2)O+O_(2),,,,(r),,1(1)/(2)),((D),,COCl_(2) to CO+Cl_(2),,,,(s),,2):}`

Options

A. `A-q,B-p,C-r,D-s`
B. `A-r,B-p,C-s,D-q`
C. `A-s,B-q,C-r,D-p`
D. `A-s,B-p,C-q,D-r`

Answer

To solve the problem of matching the reactions from Column I with their respective orders from Column II, we will analyze each reaction and determine its order based on known experimental values.

### Step-by-Step Solution:

1. **Identify Reaction A: \(2 \text{HI} \rightarrow \text{H}_2 + \text{I}_2\)**
- This reaction is known to be a second-order reaction. It involves the decomposition of hydrogen iodide (HI) and is commonly referenced in chemical kinetics.
- **Match:** A → (s) 2

2. **Identify Reaction B: \(2 \text{NH}_3 \rightarrow \text{N}_2 + 3 \text{H}_2\)**
- This reaction is part of the Haber process for ammonia synthesis. It is known to be a zero-order reaction under certain conditions, particularly when the concentration of reactants is high.
- **Match:** B → (p) 0

3. **Identify Reaction C: \(2 \text{H}_2\text{O}_2 \rightarrow 2 \text{H}_2\text{O} + \text{O}_2\)**
- The decomposition of hydrogen peroxide (H2O2) is typically a first-order reaction, especially in the presence of light or catalysts.
- **Match:** C → (q) 1

4. **Identify Reaction D: \(\text{COCl}_2 \rightarrow \text{CO} + \text{Cl}_2\)**
- The decomposition of phosgene (COCl2) is known to exhibit fractional order kinetics, specifically 1.5 or 3/2 order.
- **Match:** D → (r) 1/2

### Summary of Matches:
- A → (s) 2
- B → (p) 0
- C → (q) 1
- D → (r) 1/2

### Final Answer:
The correct matching is:
- A → s
- B → p
- C → q
- D → r