Iso - butylene when subjected to hydroboration oxidation reaction yields

Options

A. Sec-butyl alcohol
B. Tert-butyl alcohol
C. Iso-butyl alcohol
D. n-butyl alcohol

Answer

To solve the question regarding the product of the hydroboration-oxidation reaction of isobutylene, we can follow these steps:

### Step 1: Understand the Structure of Isobutylene
Isobutylene, also known as 2-methylpropene, has the following structure:

```
CH3
|
CH2 = C
|
CH3
```

### Step 2: Identify the Hydroboration Reaction
In the hydroboration reaction, isobutylene reacts with diborane (B2H6). This reaction adds boron across the double bond of isobutylene.

### Step 3: Perform the Hydroboration
During hydroboration, the boron atom attaches to the less substituted carbon atom of the double bond (according to the anti-Markovnikov rule). This results in the formation of an organoborane intermediate.

### Step 4: Oxidation of the Organoborane
The organoborane intermediate is then oxidized using hydrogen peroxide (H2O2) in the presence of a base (usually NaOH). This process replaces the boron atom with a hydroxyl group (OH), resulting in the formation of an alcohol.

### Step 5: Identify the Product
Following the hydroboration-oxidation of isobutylene, we obtain isobutyl alcohol (2-methylpropan-1-ol) as the final product. The structure of isobutyl alcohol is:

```
CH3
|
CH3 - C - OH
|
CH3
```

### Final Answer
Isobutylene when subjected to hydroboration-oxidation reaction yields **isobutyl alcohol**.

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