Product of the given reaction `CH_3CH_2-CH=CH_3overset(SiO_2)rarr` will be

Options

A. `CH_3-overset(OH)overset(|)(CH)-CH=CH_2`
B. `overset(OH)overset(|" ")(CH_2)-CH_2-CH=CH_2`
C. `CH_3-CH_2-underset(O)underset(||)C-CH_3`
D. `CH_3-CH_2-underset(O)underset(||)C-CHO`

Answer

To solve the question regarding the product of the reaction \( \text{CH}_3\text{CH}_2\text{CH}=\text{CH}_2 \) with \( \text{SiO}_2 \), we will follow a systematic approach to understand the reaction mechanism and derive the final product step by step.

### Step 1: Identify the Reactants
The reactant is \( \text{CH}_3\text{CH}_2\text{CH}=\text{CH}_2 \), which is 1-butene. We are reacting this with silicon dioxide (\( \text{SiO}_2 \)).

**Hint:** Recognize the structure of the alkene and the role of \( \text{SiO}_2 \) as a catalyst in the reaction.

### Step 2: Reaction with \( \text{SiO}_2 \)
When 1-butene reacts with \( \text{SiO}_2 \), the double bond in the alkene will interact with the silicon atom. The double bond will break, and one of the carbon atoms will form a bond with silicon, while a hydrogen atom will be eliminated.

**Hint:** Understand that the double bond is reactive and can form new bonds with the silicon atom.

### Step 3: Formation of an Intermediate
The reaction leads to the formation of an intermediate where the silicon is bonded to one of the carbons from the original double bond. The structure can be represented as:
\[ \text{CH}_3\text{CH}=\text{CH}-\text{Si}-\text{O} \]
This intermediate is unstable and will undergo further rearrangement.

**Hint:** Keep track of the bonding changes and the stability of the intermediate formed.

### Step 4: Rearrangement
The unstable intermediate will undergo a 2,3-sigmatropic rearrangement. The double bond will migrate, and the oxygen will form a bond with the adjacent carbon atom. This results in the formation of a new double bond.

**Hint:** Recognize the concept of sigmatropic rearrangement which involves the migration of a double bond.

### Step 5: Final Product Formation
After the rearrangement, the product will be:
\[ \text{CH}_3\text{CH}=\text{CH}-\text{CH}_2\text{OH} \]
This product has a hydroxyl group (-OH) attached to the second carbon atom.

**Hint:** Identify the functional groups in the final product and confirm the placement of the hydroxyl group.

### Step 6: Compare with Options
Now, we compare the derived product with the given options:
- Option A: \( \text{CH}_3\text{CH(OH)}\text{CH}=\text{CH}_2 \) (This matches our product)
- Option B: Hydroxyl at the first carbon (Incorrect)
- Option C: Carbonyl group (Incorrect)
- Option D: Aldehyde group (Incorrect)

**Hint:** Carefully evaluate each option to find the one that matches the derived product.

### Conclusion
The final product of the reaction \( \text{CH}_3\text{CH}_2\text{CH}=\text{CH}_2 \) with \( \text{SiO}_2 \) is:
\[ \text{CH}_3\text{CH(OH)}\text{CH}=\text{CH}_2 \]
Thus, the correct answer is **Option A**.