Elimination reaction of 2-Bromopentane to form pent-2-ene is:
a) `beta`- Ellimination reaction
b) Follows Zaitsev rule
c) Dehydrohalogenation reaction
d) Dehydration reaction

Options

A. a),b),c)
B. a),c),d)
C. b),c),d)
D. a),b),d)

Answer

To solve the question regarding the elimination reaction of 2-Bromopentane to form Pent-2-ene, we will analyze each option step by step.

### Step 1: Identify the structure of 2-Bromopentane
2-Bromopentane has the following structure:
- It is a five-carbon chain (pentane) with a bromine atom attached to the second carbon.
- The structure can be represented as:
```
CH3-CHBr-CH2-CH2-CH3
```

### Step 2: Understand the elimination reaction
In an elimination reaction, a molecule (in this case, 2-bromopentane) loses atoms or groups to form a double bond, resulting in an alkene (pent-2-ene).

### Step 3: Determine the product
The product of the elimination reaction of 2-Bromopentane is Pent-2-ene, which has the following structure:
- The double bond is between the second and third carbon atoms:
```
CH3-CH=CH-CH2-CH3
```

### Step 4: Analyze the options
1. **Beta-Elimination Reaction**:
- This is correct. In beta-elimination, the hydrogen atom is removed from the beta carbon (the carbon adjacent to the carbon holding the leaving group, which is bromine in this case).

2. **Follows Zaitsev Rule**:
- This is also correct. The Zaitsev rule states that in elimination reactions, the more substituted alkene is favored. In this case, Pent-2-ene is more substituted than the alternative product (Pent-1-ene).

3. **Dehydrohalogenation Reaction**:
- This is correct as well. Dehydrohalogenation refers to the elimination of a hydrogen atom and a halogen atom (bromine) to form the alkene.

4. **Dehydration Reaction**:
- This is incorrect. Dehydration reactions specifically involve the removal of water (H2O) and are typically associated with alcohols, not halides.

### Conclusion
Based on the analysis:
- The correct statements regarding the elimination reaction of 2-Bromopentane to form Pent-2-ene are:
- a) Beta-Elimination Reaction (Correct)
- b) Follows Zaitsev Rule (Correct)
- c) Dehydrohalogenation Reaction (Correct)
- d) Dehydration Reaction (Incorrect)

### Final Answer
The correct options are: a), b), and c).