Phenol and benzyl alcohol are

Options

A. functional isomers
B. Homologous
C. position isomers
D. none of these

Answer

To determine the relationship between phenol and benzyl alcohol, we will analyze their structures and chemical formulas step by step.

### Step 1: Identify the structures of Phenol and Benzyl Alcohol
- **Phenol**: The structure of phenol consists of a benzene ring (C6H5) with a hydroxyl group (–OH) attached directly to it. The chemical formula for phenol is C6H5OH.

- **Benzyl Alcohol**: The structure of benzyl alcohol consists of a benzene ring (C6H5) with a –CH2OH group attached to it. The chemical formula for benzyl alcohol is C6H5CH2OH.

### Step 2: Compare the chemical formulas
- **Phenol**: C6H5OH
- **Benzyl Alcohol**: C6H5CH2OH

When we compare the two formulas, we can see that:
- Phenol has the formula C6H6O.
- Benzyl alcohol has the formula C7H8O.

The difference in their formulas indicates that they do not have the same molecular formula, which is a requirement for them to be classified as isomers.

### Step 3: Determine the type of isomerism
- **Functional Isomers**: These are compounds that have the same molecular formula but different functional groups. Since phenol and benzyl alcohol do not have the same molecular formula, they cannot be functional isomers.

- **Positional Isomers**: These are compounds that have the same molecular formula and the same functional group but differ in the position of the functional group. Again, since the molecular formulas are different, they cannot be positional isomers.

- **Homologous Series**: This refers to a series of compounds that differ by a repeating unit, typically –CH2. Since phenol and benzyl alcohol do not belong to the same series and have different properties, they cannot be homologous.

### Step 4: Conclusion
Since phenol and benzyl alcohol do not share the same molecular formula and do not fit into any of the isomer categories (functional isomers, positional isomers, or homologous series), the correct classification for their relationship is "none of these."

### Final Answer:
Phenol and benzyl alcohol are **none of these** (not functional isomers, not positional isomers, and not homologous).

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