One mole of alkene an ozonolysis gives two moles of butanone. The alkene is :

Options

A. 2, 4-dimethylhex-2-ene
B. 2, 3-dimethylhex-3-ene
C. 3, 4-dimethylhex-3-ene
D. 2, 4-dimethylhex-2-ene

Explanation

To solve the problem of identifying the alkene that, upon ozonolysis, yields two moles of butanone, we can follow these steps:

### Step 1: Understand Ozonolysis
Ozonolysis is a reaction where alkenes react with ozone (O₃) to form carbonyl compounds (aldehydes or ketones). The double bond in the alkene is cleaved, resulting in the formation of carbonyl groups.

**Hint:** Recall that ozonolysis typically breaks the double bond of alkenes and forms carbonyl compounds.

### Step 2: Analyze the Product
The problem states that one mole of alkene produces two moles of butanone. Butanone (C₄H₈O) has the structure CH₃COCH₂CH₃. Therefore, the ozonolysis of the alkene must yield two molecules of butanone.

**Hint:** Identify the structure of butanone and consider how it can be formed from an alkene.

### Step 3: Determine the Structure of the Alkene
To produce two moles of butanone, we can deduce that the alkene must have a double bond that, when cleaved, results in two identical carbonyl fragments that correspond to butanone. The simplest way to achieve this is to consider an alkene that has a symmetrical structure.

The alkene that fits this description is 3,4-dimethyl-3-hexene. When ozonolysis occurs on this alkene, it breaks down to yield two molecules of butanone.

**Hint:** Consider symmetrical alkenes that can produce identical carbonyl products upon ozonolysis.

### Step 4: Write the Reaction
The ozonolysis of 3,4-dimethyl-3-hexene can be represented as follows:

1. **Starting Alkene:** 3,4-dimethyl-3-hexene
2. **Ozonolysis Reaction:**
- O₃ + Alkene → Ozonide
- Ozonide + H₂O (hydrolysis) → 2 Butanone

**Hint:** Write out the ozonolysis reaction to visualize how the alkene transforms into the carbonyl products.

### Conclusion
Thus, the alkene that gives two moles of butanone upon ozonolysis is **3,4-dimethyl-3-hexene**.

**Final Answer:** The alkene is 3,4-dimethyl-3-hexene.