The structural formula for 2-ethylprop-2-en-1-ol is :

Options

A. `CH_3 - underset(CH_3)underset(|)C = CH OH`
B. `C_2 H_5 CH= CH CH_2 OH`
C. `CH_3 - underset(C_2 H_5)underset(|)C = CH CH_2 OH`
D. `CH_2 = underset(C_2 H_5)underset(|)C-CH_(2)OH`

Answer

To derive the structural formula for 2-ethylprop-2-en-1-ol, we can follow these steps:

### Step 1: Identify the Carbon Chain
The name "2-ethylprop-2-en-1-ol" indicates that we have a propene backbone (3 carbon atoms) with an ethyl group attached to the second carbon.

### Step 2: Draw the Propene Backbone
Start by drawing the three carbon atoms in a straight chain:
```
C1 - C2 - C3
```

### Step 3: Add the Ethyl Group
The "2-ethyl" part means that there is an ethyl group (C2H5) attached to the second carbon (C2). So, we add the ethyl group to C2:
```
C2H5
|
C1 - C2 - C3
```

### Step 4: Add the Double Bond
The "prop-2-en" part indicates that there is a double bond between C2 and C3. We can represent this as:
```
C2H5
|
C1 = C2 - C3
```

### Step 5: Add the Alcohol Group
The "1-ol" indicates that there is an alcohol (-OH) group attached to the first carbon (C1). We replace one hydrogen atom on C1 with the -OH group:
```
C2H5
|
C1 - C2 = C3
|
OH
```

### Step 6: Complete the Structure
Now, we need to ensure that all carbon atoms have four bonds. We can add the remaining hydrogen atoms:
- C1 has 1 bond to OH and 2 bonds to hydrogen.
- C2 has 1 bond to C1, 1 bond to C3, and 1 bond to the ethyl group (C2H5).
- C3 has 1 bond to C2 and 2 bonds to hydrogen.

The final structural formula looks like this:
```
C2H5
|
H2C - C = C - OH
```

### Final Structural Formula
The complete structural formula for 2-ethylprop-2-en-1-ol is:
```
CH3-CH2-CH=CH-OH
```
or in expanded form:
```
C2H5
|
H2C - C = C - OH
```