Which of the following compound is not formed in haloform reaction ?

Options

A. `CHF_(3)`
B. `CHCl_(3)`
C. `CHI_(3)`
D. `CHBr_(3)`

Answer

To determine which compound is not formed in the haloform reaction, we first need to understand the haloform reaction itself.

### Step-by-Step Solution:

1. **Understanding the Haloform Reaction**:
The haloform reaction involves the reaction of a methyl ketone (R-C(=O)-CH3) with halogens (X2) in the presence of a base (usually NaOH). The general reaction can be represented as:
\[ R-C(=O)-CH3 + X2 + NaOH \rightarrow R-C(=O)O^-Na^+ + CHX3 \]
Here, CHX3 is the haloform product, where X can be a halogen such as Cl, Br, or I.

2. **Identifying Possible Halogens**:
The halogens that can participate in this reaction include Cl2, Br2, I2, and F2. However, we need to analyze the reactivity of these halogens in the haloform reaction.

3. **Analyzing the Reactivity of F2**:
Fluorine (F2) is a very reactive halogen, but due to its small size and the strength of the F-F bond, it does not participate effectively in the haloform reaction. The bond is difficult to break, which prevents the formation of the haloform product CHF3.

4. **Conclusion**:
Since F2 cannot participate in the haloform reaction, the compound that is not formed in the haloform reaction is CHF3 (trifluoromethane).

### Final Answer:
The compound that is not formed in the haloform reaction is **CHF3**.

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