Following reaction,
`(CH_3)_3 CBr +H_2O to (CH_3)_3 COH +HBr ` is an example of
elimination reaction
free radical substitution
nucleophilic substitution
electrophilic substitution.

Options

A. elimination reaction
B. free radical substitution
C. nucleophilic substitution
D. electrophilic substitution.

Explanation

To solve the question regarding the reaction `(CH₃)₃CBr + H₂O → (CH₃)₃COH + HBr`, we need to analyze the nature of the reaction taking place. Here’s a step-by-step breakdown:

### Step 1: Identify the Reactants and Products
The reactants are tert-butyl bromide `(CH₃)₃CBr` and water `H₂O`. The products are tert-butyl alcohol `(CH₃)₃COH` and hydrogen bromide `HBr`.

**Hint:** Look for the functional groups in the reactants and products to understand what changes are occurring.

### Step 2: Determine the Type of Reaction
In the given reaction, the bromine atom (Br) in tert-butyl bromide is replaced by a hydroxyl group (OH) from water. This indicates that a substitution is taking place.

**Hint:** Identify whether atoms or groups are being replaced or removed to classify the reaction.

### Step 3: Classify the Reaction
Since Br is being replaced by OH, this is a substitution reaction. We need to determine if it is nucleophilic or electrophilic. In this case, the hydroxide ion (OH⁻) acts as a nucleophile, attacking the carbon atom that is bonded to the bromine.

**Hint:** Remember that nucleophiles donate electrons, while electrophiles accept them.

### Step 4: Eliminate Other Options
- **Elimination Reaction:** This involves the removal of atoms or groups from a molecule, which is not happening here.
- **Free Radical Substitution:** This typically involves the substitution of atoms in the presence of free radicals, which is not applicable in this case.
- **Electrophilic Substitution:** This involves an electrophile attacking a nucleophile, which is not the case here since OH⁻ is the nucleophile.

**Hint:** Cross out options that do not fit the mechanism of the reaction.

### Step 5: Conclude the Type of Reaction
Since the reaction involves the nucleophilic attack of OH⁻ on the carbocation formed after the departure of Br, it is classified as a **nucleophilic substitution reaction**. More specifically, it is an **SN1 reaction** (unimolecular nucleophilic substitution) because it involves the formation of a carbocation intermediate.

**Final Answer:** The reaction `(CH₃)₃CBr + H₂O → (CH₃)₃COH + HBr` is an example of **nucleophilic substitution**.