Which of the following alcohol contains`C_(sp^3) - OH` bond?

Options

A. Allylic alcohol
B. Vinylic alcohol
C. Phenols
D. None of these

Answer

To determine which of the following alcohols contains a carbon atom that is sp³ hybridized and bonded to an -OH group, we will analyze the hybridization of the carbon atom in each alcohol. The hybridization can be determined using the steric number, which is the sum of the number of bonded atoms and lone pairs around the carbon atom.

### Step-by-Step Solution:

1. **Understand Hybridization and Steric Number**:
- The steric number is calculated as the sum of the number of sigma bonds and lone pairs on the carbon atom.
- If the steric number is:
- 2: sp hybridization
- 3: sp² hybridization
- 4: sp³ hybridization

2. **Analyze Allylic Alcohol**:
- Structure: The carbon atom bonded to the -OH group is part of a carbon chain with a double bond.
- Bonds: The carbon has four bonds (one to -OH and three to other carbon atoms).
- Lone pairs: 0
- Steric number = 4 (4 sigma bonds).
- Hybridization: sp³.
- Conclusion: The carbon in allylic alcohol is sp³ hybridized.

3. **Analyze Vinylic Alcohol**:
- Structure: The -OH group is bonded to a carbon that is part of a double bond (vinyl group).
- Bonds: The carbon has three sigma bonds (one to -OH, one to hydrogen, and one to another carbon) and one pi bond (the double bond).
- Lone pairs: 0
- Steric number = 3 (3 sigma bonds).
- Hybridization: sp².
- Conclusion: The carbon in vinylic alcohol is sp² hybridized.

4. **Analyze Phenol**:
- Structure: The -OH group is bonded to a carbon in a benzene ring.
- Bonds: The carbon has three sigma bonds (one to -OH and two to other carbons in the ring) and participates in a pi bond with the ring.
- Lone pairs: 0
- Steric number = 3 (3 sigma bonds).
- Hybridization: sp².
- Conclusion: The carbon in phenol is sp² hybridized.

5. **Final Conclusion**:
- Among the options, only allylic alcohol contains a carbon atom that is sp³ hybridized and bonded to an -OH group.

### Answer:
The alcohol that contains a C(sp³) - OH bond is **Allylic Alcohol**.