Acid catalysed hydration of alkene is an example for

Options

A. free radical substitution
B. nucleophilic substitution
C. nucleophilic addition
D. electrophilic addition.

Explanation

To solve the question "Acid catalyzed hydration of alkene is an example for," we can break it down into the following steps:

### Step 1: Understanding Acid Catalyzed Hydration
Acid catalyzed hydration of alkenes involves the addition of water (H2O) across the double bond of an alkene in the presence of an acid catalyst. This process leads to the formation of an alcohol.

**Hint:** Remember that hydration means the addition of water.

### Step 2: Mechanism of the Reaction
1. The alkene (RCH=CH2) reacts with an acid (H+) which protonates one of the carbon atoms in the double bond, forming a carbocation (RCH^+-CH3).
2. The carbocation is then attacked by water (H2O), which acts as a nucleophile, leading to the formation of an alcohol (RCH(OH)-CH3).

**Hint:** Focus on the role of the acid in generating the carbocation intermediate.

### Step 3: Identifying the Type of Reaction
The reaction involves the formation of a carbocation and the subsequent nucleophilic attack by water. This indicates that the reaction is an addition reaction where the nucleophile (water) adds to the electrophile (carbocation).

**Hint:** Look for the key terms: nucleophile, electrophile, and addition.

### Step 4: Classifying the Reaction
In the context of the options provided:
- Nucleophilic substitution: This involves replacing one nucleophile with another.
- Free radical substitution: This involves free radicals and is not applicable here.
- Nucleophilic addition: This typically involves a nucleophile adding to a carbonyl group, which is not the case here.
- Electrophilic addition: This is the correct classification since the reaction starts with an alkene (an electrophile) and involves the addition of water.

**Hint:** Determine which type of reaction involves the addition of components to a double bond.

### Conclusion
The acid catalyzed hydration of alkene is an example of **electrophilic addition**.

**Final Answer:** Electrophilic addition (Option 4).