The number of isomeric pentyl alcohols possible is

Options

A. Two
B. Four
C. Six
D. Eight

Explanation

To determine the number of isomeric pentyl alcohols, we need to analyze the structure of pentyl alcohols, which are alcohols with a five-carbon chain (C5H12O). The alcohol functional group (-OH) can be placed at different positions along the carbon chain, leading to structural isomers.

### Step-by-Step Solution:

1. **Identify the Carbon Skeleton**:
- The base structure for pentyl alcohol is a straight-chain of 5 carbon atoms (C5).
- The molecular formula for pentyl alcohol is C5H12O.

2. **Determine Possible Positions for the Hydroxyl Group (-OH)**:
- The hydroxyl group can be attached to different carbon atoms in the chain.
- For a straight-chain pentyl alcohol, the -OH can be attached to:
- Carbon 1 (1-pentanol)
- Carbon 2 (2-pentanol)
- Carbon 3 (3-pentanol)
- Carbon 4 (4-pentanol)
- However, since we are looking for isomers, we also need to consider branched structures.

3. **Consider Branched Isomers**:
- We can create branched isomers by rearranging the carbon skeleton.
- The branched structures include:
- 2-methyl-1-butanol (where the -OH is on the first carbon)
- 3-methyl-1-butanol (where the -OH is on the first carbon)
- 2-methyl-2-butanol (where the -OH is on the second carbon)
- 3-methyl-2-butanol (where the -OH is on the second carbon)

4. **Count All Unique Structures**:
- The unique isomeric forms of pentyl alcohol include:
1. 1-pentanol
2. 2-pentanol
3. 3-pentanol
4. 2-methyl-1-butanol
5. 3-methyl-1-butanol
6. 2-methyl-2-butanol
7. 3-methyl-2-butanol

5. **Final Count**:
- After considering both straight-chain and branched isomers, we find a total of **8 isomeric pentyl alcohols**.

### Conclusion:
The total number of isomeric pentyl alcohols possible is **8**.