Which of the following displacement does not occur:

Options

A. `Zn+2H^(+)toZn^(2+)+H_(2)uarr`
B. `Fe+2Ag^(+)toFe^(2+)+Agdarr`
C. `Cu+Fe^(2+)toCu^(2+)+Fedarr`
D. `Zn+Pb^(2+)toZn^(2+)+Pbdarr`

Answer

To determine which displacement does not occur among the given reactions, we need to analyze the reactivity of the metals involved based on the reactivity series. Here's a step-by-step solution:

### Step 1: Understand the Reactivity Series
The reactivity series is a list of metals arranged in order of decreasing reactivity. The more reactive metal can displace a less reactive metal from its compound. The order of reactivity is as follows:
- Potassium (K)
- Sodium (Na)
- Calcium (Ca)
- Magnesium (Mg)
- Aluminium (Al)
- Carbon (C)
- Zinc (Zn)
- Iron (Fe)
- Tin (Sn)
- Lead (Pb)
- Hydrogen (H)
- Copper (Cu)
- Silver (Ag)
- Gold (Au)
- Platinum (Pt)

### Step 2: Analyze Each Reaction
1. **Zinc displacing Hydrogen**:
- Reaction: Zn + 2H⁺ → Zn²⁺ + H₂
- Zinc is more reactive than hydrogen, so this reaction occurs.

2. **Iron displacing Silver**:
- Reaction: Fe + 2Ag⁺ → Fe²⁺ + 2Ag
- Iron is more reactive than silver, so this reaction occurs.

3. **Copper displacing Iron**:
- Reaction: Cu + Fe²⁺ → Cu²⁺ + Fe
- Copper is less reactive than iron, so this reaction does not occur.

4. **Zinc displacing Lead**:
- Reaction: Zn + Pb²⁺ → Zn²⁺ + Pb
- Zinc is more reactive than lead, so this reaction occurs.

### Step 3: Conclusion
From the analysis, the reaction that does not occur is the one where copper attempts to displace iron. Therefore, the answer is:

**Answer: Copper does not displace iron (Option 3).**