Question:
Alcoholic group of which position in the given molecule reacts fastest with Lucas' reagent?
Alcoholic group of which position in the given molecule reacts fastest with Lucas' reagent?
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Lucas reagent is a quick test: 3° > 2° > 1° (rate of reaction).
Updated On: Apr 22, 2026
- 1
- 4
- 5
- 6
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The Correct Option is B
Solution and Explanation
Concept:
Lucas test:
• Tertiary alcohol $\longrightarrow$ fastest reaction
• Secondary alcohol $\longrightarrow$ moderate
• Primary alcohol $\longrightarrow$ slow
Step 1: Identify alcohol types.
Position 1 $\longrightarrow$ primary
Position 6 $\longrightarrow$ primary
Position 5 $\longrightarrow$ secondary
Position 4 $\longrightarrow$ tertiary (attached to three carbons)
Step 2: Apply Lucas rule.
Tertiary alcohol reacts fastest.
Step 3: Conclusion.
Position 4 reacts fastest.
• Tertiary alcohol $\longrightarrow$ fastest reaction
• Secondary alcohol $\longrightarrow$ moderate
• Primary alcohol $\longrightarrow$ slow
Step 1: Identify alcohol types.
Position 1 $\longrightarrow$ primary
Position 6 $\longrightarrow$ primary
Position 5 $\longrightarrow$ secondary
Position 4 $\longrightarrow$ tertiary (attached to three carbons)
Step 2: Apply Lucas rule.
Tertiary alcohol reacts fastest.
Step 3: Conclusion.
Position 4 reacts fastest.
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