The starting materials for the preparation of styrene is

Options

A. Ehtane
B. Ethene
C. Ethyne
D. Vinyl chloride

Answer

To prepare styrene, we need to identify the starting materials involved in its synthesis. Styrene is an aromatic compound that can be synthesized from benzene and ethyne. Here’s a step-by-step breakdown of the process:

### Step-by-Step Solution:

1. **Identify the Target Compound**: The target compound is styrene, which has the chemical formula C8H8 and consists of a benzene ring with an ethylene group (vinyl group) attached.

2. **Select the Starting Materials**: The primary starting materials for the preparation of styrene are:
- **Benzene (C6H6)**: This is the aromatic compound that forms the base of styrene.
- **Ethyne (C2H2)**: This is an alkyne that provides the vinyl group necessary for the formation of styrene.

3. **Reaction Conditions**: The reaction typically requires:
- **Heating**: The mixture of benzene and ethyne is heated to a high temperature (around 650 K).
- **Acid Catalyst**: An acid catalyst is used to facilitate the reaction, promoting the addition of the ethyne to the benzene ring.

4. **Formation of Styrene**: When benzene reacts with ethyne under the specified conditions, styrene is formed as a product. The reaction can be represented as:
\[ \text{C}_6\text{H}_6 + \text{C}_2\text{H}_2 \xrightarrow{\text{Heat, Acid Catalyst} } \text{C}_6\text{H}_5\text{CH}=\text{CH}_2 \]
This shows that the ethyne adds to the benzene ring, resulting in the formation of styrene.

### Final Answer:
The starting materials for the preparation of styrene are **benzene (C6H6)** and **ethyne (C2H2)**.

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