The correct combination of names for isomeric alcohols with molecular formula `C_(4)H_(10)O` is/are

Options

A. tert-butanol and 2-methylpropan-2-ol
B. tert-butanol and 1,1-dimethylethan-1-ol
C. n-butanol and butan-1-ol
D. isobutyl alcohol and 2-methylpropan-1-o

Answer

To determine the correct combination of names for isomeric alcohols with the molecular formula C₄H₁₀O, we will identify the possible structural isomers and their corresponding IUPAC names.

### Step-by-Step Solution:

1. **Identify the Molecular Formula**:
- The molecular formula given is C₄H₁₀O, which indicates that we are looking for alcohols (compounds containing an -OH group).

2. **Determine the Possible Structures**:
- Alcohols can have different structural arrangements (isomers) based on the position of the hydroxyl (-OH) group and the carbon skeleton.

3. **List the Isomeric Alcohols**:
- **Butan-1-ol (or n-butanol)**:
- Structure: CH₃-CH₂-CH₂-CH₂OH
- This is a straight-chain alcohol.
- **Butan-2-ol**:
- Structure: CH₃-CH(OH)-CH₂-CH₃
- This is a secondary alcohol where the -OH group is on the second carbon.
- **2-Methylpropan-2-ol (or tert-butanol)**:
- Structure: (CH₃)₃COH
- This is a tertiary alcohol where the -OH group is attached to a carbon that is bonded to three other carbons.
- **2-Methylpropan-1-ol**:
- Structure: CH₃-CH(CH₃)-CH₂OH
- This is another isomer where the -OH group is on the first carbon of the branched chain.

4. **Assign IUPAC Names**:
- The IUPAC names for the identified isomers are:
- Butan-1-ol
- Butan-2-ol
- 2-Methylpropan-2-ol
- 2-Methylpropan-1-ol

5. **Conclusion**:
- The correct combination of names for the isomeric alcohols with the molecular formula C₄H₁₀O includes:
- A: Butan-1-ol
- C: Butan-2-ol
- D: 2-Methylpropan-1-ol
- The common names can also be used for some of these isomers, such as tert-butanol for 2-Methylpropan-2-ol.

### Final Answer:
The correct combination of names for isomeric alcohols with molecular formula C₄H₁₀O is:
- A: Butan-1-ol
- C: Butan-2-ol
- D: 2-Methylpropan-1-ol