Identify the incorrect reactions.
(A) `Mg + CuSO_4 to MgSO_4 + Cu`
(B) `Cu + 2AgNO_3 to 2Ag + Cu(NO_3)_2`
(C) `3Cu + Al2(SO_4)_3 to 3CuSO_4 + 2AI`
(D) `Fe + ZnSO_4 to FeSO_4 + Zn`

Options

A. (A) and (B)
B. (A) and (D)
C. (C) and (D)
D. (A), (B), (C)and (D)

Explanation

To identify the incorrect reactions from the given options, we will analyze each reaction based on the principles of displacement reactions and the reactivity series of metals.

### Step-by-Step Solution:

1. **Analyze Reaction A: `Mg + CuSO4 → MgSO4 + Cu`**
- Magnesium (Mg) is more reactive than copper (Cu).
- In a displacement reaction, a more reactive metal can displace a less reactive metal from its compound.
- Here, Mg displaces Cu from CuSO4, forming MgSO4 and releasing Cu.
- **Conclusion:** This reaction is correct.

2. **Analyze Reaction B: `Cu + 2AgNO3 → 2Ag + Cu(NO3)2`**
- Copper (Cu) is less reactive than silver (Ag).
- In a displacement reaction, a less reactive metal cannot displace a more reactive metal from its compound.
- Here, Cu cannot displace Ag from AgNO3.
- **Conclusion:** This reaction is incorrect.

3. **Analyze Reaction C: `3Cu + Al2(SO4)3 → 3CuSO4 + 2Al`**
- Aluminum (Al) is more reactive than copper (Cu).
- In a displacement reaction, a more reactive metal can displace a less reactive metal.
- Here, Al cannot be displaced by Cu because Al is more reactive.
- **Conclusion:** This reaction is incorrect.

4. **Analyze Reaction D: `Fe + ZnSO4 → FeSO4 + Zn`**
- Zinc (Zn) is more reactive than iron (Fe).
- In a displacement reaction, a less reactive metal cannot displace a more reactive metal.
- Here, Fe cannot displace Zn from ZnSO4.
- **Conclusion:** This reaction is incorrect.

### Final Summary:
- The incorrect reactions are **B, C, and D**.
- The correct answer for the question is that reactions **B, C, and D** are incorrect.