Question:
Which of the following acid strength is used to get good yield of alkyl iodide from alcohol and sodium iodide in phosphoric acid?
Which of the following acid strength is used to get good yield of alkyl iodide from alcohol and sodium iodide in phosphoric acid?
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Rule:
Higher acid concentration $\rightarrow$ Better yield of alkyl halide
Updated On: May 8, 2026
- 15%
- 35%
- 65%
- 95%
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The Correct Option is D
Solution and Explanation
Concept: Alkyl iodide is prepared by heating alcohol with sodium iodide in concentrated phosphoric acid.
• Highly concentrated $\text{H}_3\text{PO}_4$ is required.
• It acts as a dehydrating agent and helps in efficient substitution.
Step 1: Requirement for reaction.
High acid concentration ensures better yield.
Step 2: Conclusion.
Thus, $95\%$ phosphoric acid is used. Final Answer: Option (D)
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