Question:
Identify the allylic alcohol in the following.
Identify the allylic alcohol in the following.
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Always count the carbons. If the $-OH$ is on the $C_1$ and the double bond is between $C_2$ and $C_3$, it is allylic.
Updated On: Jun 26, 2026
- $C_6H_5CH_2OH$
- $C_6H_5-CH=CH-C(CH_3)_2-OH$
- $CH_2=CH-OH$
- $C_6H_5-CH_2-CH_2-OH$
- $CH_2=CH-CH_2-CH_2-OH$
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
An allylic alcohol is a compound where the hydroxyl ($-OH$) group is attached to an $sp^3$-hybridized carbon atom which is directly adjacent to a carbon-carbon double bond ($C=C-C-OH$).
Step 2: Detailed Explanation:
1. Option A: $C_6H_5CH_2OH$ is benzyl alcohol. The carbon is adjacent to an aromatic ring, not a simple $C=C$ chain.
2. Option B: $C_6H_5-CH=CH-C(CH_3)_2-OH$. Here, the $-OH$ is on an $sp^3$ carbon (the one with two methyl groups) which is directly attached to the $CH=CH$ double bond. This fits the definition of an allylic alcohol perfectly.
3. Option C: $CH_2=CH-OH$ is vinyl alcohol (vinylic, not allylic).
4. Option E: $CH_2=CH-CH_2-CH_2-OH$. The $-OH$ is two carbons away from the double bond (homoallylic).
Step 3: Final Answer:
The allylic alcohol is option (B).
An allylic alcohol is a compound where the hydroxyl ($-OH$) group is attached to an $sp^3$-hybridized carbon atom which is directly adjacent to a carbon-carbon double bond ($C=C-C-OH$).
Step 2: Detailed Explanation:
1. Option A: $C_6H_5CH_2OH$ is benzyl alcohol. The carbon is adjacent to an aromatic ring, not a simple $C=C$ chain.
2. Option B: $C_6H_5-CH=CH-C(CH_3)_2-OH$. Here, the $-OH$ is on an $sp^3$ carbon (the one with two methyl groups) which is directly attached to the $CH=CH$ double bond. This fits the definition of an allylic alcohol perfectly.
3. Option C: $CH_2=CH-OH$ is vinyl alcohol (vinylic, not allylic).
4. Option E: $CH_2=CH-CH_2-CH_2-OH$. The $-OH$ is two carbons away from the double bond (homoallylic).
Step 3: Final Answer:
The allylic alcohol is option (B).
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