Which statement is wrong :-

Options

A. (a)Haber's process of `NH_(3)` required iron as catalyst
B. (b)Friedel-craft's reaction requires anhydrous `AlCl_(3)`
C. (c)Hydrogenation of oils requires iron as catalyst
D. (d)Oxidation of `SO_(2)` to `SO_(3)` required `V_(2)O_(5)`

Answer

To determine which statement is wrong, we will analyze each statement one by one.

### Step 1: Analyze Statement A
**Statement A:** The Haber process of ammonia requires iron as a catalyst.

- The Haber process involves the reaction of nitrogen (N2) and hydrogen (H2) to produce ammonia (NH3).
- The reaction is represented as:
\[ N_2 + 3H_2 \rightarrow 2NH_3 \]
- Iron is indeed used as a catalyst in this process to increase the rate of reaction.

**Conclusion:** Statement A is true.

### Step 2: Analyze Statement B
**Statement B:** Friedel-Crafts reaction requires anhydrous AlCl3.

- The Friedel-Crafts reaction is a type of electrophilic aromatic substitution.
- Anhydrous aluminum chloride (AlCl3) is used as a catalyst to generate the electrophile that reacts with the benzene ring.

**Conclusion:** Statement B is true.

### Step 3: Analyze Statement C
**Statement C:** Hydrogenation of oils requires iron as a catalyst.

- Hydrogenation of oils refers to the process of converting unsaturated fats (oils) into saturated fats (like margarine).
- Common catalysts used in this process are nickel, palladium, or platinum, not iron.

**Conclusion:** Statement C is false.

### Step 4: Analyze Statement D
**Statement D:** Oxidation of SO2 requires vanadium pentoxide as a catalyst.

- The reaction involves the oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3):
\[ 2SO_2 + O_2 \rightarrow 2SO_3 \]
- Vanadium pentoxide (V2O5) is indeed used as a catalyst in this reaction to enhance the rate of the reaction.

**Conclusion:** Statement D is true.

### Final Conclusion
The wrong statement among the options provided is **Statement C**, which incorrectly states that iron is required as a catalyst for the hydrogenation of oils.

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