Hydrogen can react with the following even in dark:

Options

A. `I_(2)`
B. `Cl_(2)`
C. `F_(2)`
D. `Br_(2)`

Answer

To solve the question "Hydrogen can react with the following even in dark," we need to analyze the options provided and understand the reactivity of hydrogen with different halogens.

### Step-by-Step Solution:

1. **Understanding the Reactivity of Hydrogen with Halogens**:
- Hydrogen can react with halogens to form hydrogen halides (HX), where X represents a halogen (F, Cl, Br, I).
- The general reaction can be represented as:
\[ H_2 + X_2 \rightarrow 2HX \]

2. **Analyzing Each Option**:
- **Option A: Iodine (I2)**:
- Iodine typically requires heat and a catalyst to react with hydrogen. Therefore, it does not react in the dark.
- **Option B: Chlorine (Cl2)**:
- Chlorine reacts with hydrogen, but this reaction usually requires sunlight or UV light to initiate. Hence, it does not react in the dark.
- **Option C: Fluorine (F2)**:
- Fluorine is highly reactive and can react with hydrogen even in the dark. The reaction is:
\[ H_2 + F_2 \rightarrow 2HF \]
- This makes fluorine the correct answer.
- **Option D: Bromine (Br2)**:
- Bromine requires heating and a catalyst to react with hydrogen, so it does not react in the dark.

3. **Conclusion**:
- Based on the analysis, the only halogen that can react with hydrogen even in the dark is **Fluorine (F2)**.

### Final Answer:
The correct option is **C: F2 (Fluorine)**.

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