Correct statement about 1 , 3 - butandiene is

Options

A. Conjugated double bonds are present
B. Reacts with HBr
C. Forms polymer
D. All of these

Explanation

To solve the question regarding the correct statement about 1,3-butadiene, we need to analyze its structure and properties. Here’s a step-by-step breakdown:

### Step 1: Understand the Structure of 1,3-Butadiene
1,3-butadiene is a conjugated diene with the following structure:

```
H2C=CH-CH=CH2
```

- The first carbon (C1) and the third carbon (C3) are involved in double bonds.
- The molecule has a total of four carbon atoms.

### Step 2: Identify the Properties of 1,3-Butadiene
1. **Reactivity**: 1,3-butadiene can undergo electrophilic addition reactions due to the presence of double bonds.
2. **Stability of Carbocation**: When 1,3-butadiene reacts, it can form an allylic carbocation, which is stabilized by resonance.

### Step 3: Discuss the Reactions of 1,3-Butadiene
1. **Electrophilic Addition**: When 1,3-butadiene reacts with HBr, it can form two types of products:
- **1,2-Addition Product**: This product results from the addition of HBr across the double bond between C1 and C2.
- **1,4-Addition Product**: This product results from the addition of HBr across the double bond between C1 and C4.

2. **Polymerization**: 1,3-butadiene can also undergo polymerization to form synthetic rubber, known as Buna-S when it reacts with styrene.

### Step 4: Conclusion
Based on the properties and reactions of 1,3-butadiene, the correct statements about it include:
- It can form both 1,2 and 1,4 addition products when reacting with HBr.
- It can polymerize to form Buna-S when reacted with styrene.
- It has an allylic carbocation that is stabilized by resonance.

### Final Answer
Thus, the correct answer is that all of the statements regarding 1,3-butadiene are correct.

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