Which of following hydrocarbon can react with maleic anhydride?

Options

A.
B.
C.
D. None of these

Explanation

To determine which hydrocarbon can react with maleic anhydride, we need to focus on the Diels-Alder reaction, which requires a diene and a dienophile. Here’s a step-by-step solution:

### Step 1: Understand Maleic Anhydride
Maleic anhydride is a compound that contains a double bond and can act as a dienophile in the Diels-Alder reaction. It is crucial to identify the structure of maleic anhydride, which has a cyclic anhydride structure with a double bond.

**Hint:** Maleic anhydride is a key reactant in the Diels-Alder reaction and serves as a dienophile.

### Step 2: Identify the Hydrocarbons
We need to analyze the given hydrocarbons to identify which of them are dienes. A diene is a compound that contains two double bonds.

**Hint:** Look for structures that contain two double bonds in conjugation or that can be converted into a cis-diene.

### Step 3: Check for Cis-Diene
For the Diels-Alder reaction to occur, the diene must be in a cis configuration. This means that the two double bonds must be oriented such that they can properly align with the dienophile (maleic anhydride).

**Hint:** A cis-diene has both double bonds on the same side, allowing for effective overlap with the dienophile.

### Step 4: Analyze Each Option
- **Option 1:** If the diene is trans, it cannot react with maleic anhydride.
- **Option 2:** If this diene can rotate around a sigma bond to form a cis configuration, it can react with maleic anhydride.
- **Option 3:** If this diene is conjugated with a benzene ring, it may not be suitable for the reaction.
- **Option 4:** If this diene is out of conjugation, it will not react.

**Hint:** Pay attention to the ability of the diene to rotate and form a cis configuration.

### Step 5: Conclusion
After analyzing the options, we find that **Option 2** is the only hydrocarbon that can react with maleic anhydride because it can form a cis-diene through rotation around a sigma bond.

**Final Answer:** The hydrocarbon that can react with maleic anhydride is **Option 2**.