The compound which reacts with excess bromine to produce 2, 4, 6-tribromophenol, is

Options

A. 1, 3-cyclohexadiene
B. 1, 3-cyclohexanedione
C. salicylic acid
D. cyclohexanone

Explanation

To solve the question of which compound reacts with excess bromine to produce 2,4,6-tribromophenol, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Product**: The product we are looking for is 2,4,6-tribromophenol. This compound has a phenolic structure with three bromine atoms substituted on the benzene ring at the 2, 4, and 6 positions, and one hydroxyl (-OH) group.

2. **Understand the Reactivity with Bromine**: Bromine reacts with phenolic compounds, particularly those that have activating groups like -OH. The presence of the -OH group on the benzene ring increases the electron density, making it more reactive towards electrophilic substitution reactions, such as bromination.

3. **Identify the Starting Compound**: The compound that is known to react with excess bromine to yield 2,4,6-tribromophenol is salicylic acid, which is also known as 2-hydroxybenzoic acid. The structure of salicylic acid includes a hydroxyl group (-OH) attached to a benzene ring.

4. **Reaction Mechanism**: When salicylic acid is treated with excess bromine, the bromine atoms will substitute at the ortho (2) and para (4) positions relative to the -OH group due to the activating effect of the -OH group. The third bromine will substitute at the meta (6) position, resulting in 2,4,6-tribromophenol.

5. **Conclusion**: Therefore, the compound that reacts with excess bromine to produce 2,4,6-tribromophenol is salicylic acid (2-hydroxybenzoic acid).

### Final Answer:
The compound which reacts with excess bromine to produce 2,4,6-tribromophenol is **salicylic acid (2-hydroxybenzoic acid)**.

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