Alcohol Reactions and Halogen Acid Quiz
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Questions and Answers

For the reaction of primary and secondary alcohols with HCl, what is required as a catalyst?

  • ZnCl2 (correct)
  • H2SO4
  • H3PO4
  • NaCl
  • What is the preferred reagent to replace the hydroxyl group of an alcohol with a halogen?

  • Thionyl chloride (correct)
  • Phosphorus halides
  • Concentrated HCl
  • Concentrated halogen acids
  • How are good yields of R—I obtained from alcohols?

  • By heating with sodium or potassium iodide in 95% orthophosphoric acid (correct)
  • By direct reaction with iodine gas
  • By treating with iodine and water
  • By refluxing with concentrated HI
  • What is used for preparing alkyl bromide through constant boiling?

    <p>HBr (48%)</p> Signup and view all the answers

    What is usually generated in situ for the reaction with red phosphorus, bromine, and iodine?

    <p>Phosphorus tribromide and triiodide</p> Signup and view all the answers

    Describe the reaction of an alcohol with thionyl chloride. What are the products formed and why is thionyl chloride preferred for this reaction?

    <p>Thionyl chloride replaces the hydroxyl group of an alcohol with a halogen to form an alkyl halide along with the gases SO2 and HCl. Thionyl chloride is preferred because the gaseous products are escapable, resulting in the formation of pure alkyl halides.</p> Signup and view all the answers

    How is alkyl bromide prepared and what reagent is used for this process?

    <p>Alkyl bromide is prepared through constant boiling with HBr (48%). Good yields of alkyl bromide can be obtained using this method.</p> Signup and view all the answers

    What is the catalyst required for the reaction of primary and secondary alcohols with HCl? How is the reaction of tertiary alcohols with HCl conducted?

    <p>The reaction of primary and secondary alcohols with HCl requires the presence of a catalyst, ZnCl2. The reaction of tertiary alcohols with HCl is conducted by simply shaking the alcohol with concentrated HCl at room temperature.</p> Signup and view all the answers

    What method is used to obtain good yields of R—I from alcohols? Describe the process involved.

    <p>Good yields of R—I may be obtained by heating alcohols with sodium or potassium iodide in 95% orthophosphoric acid.</p> Signup and view all the answers

    Explain the order of reactivity of alcohols with a given haloacid.

    <p>The order of reactivity of alcohols with a given haloacid is 3°&gt;2°&gt;1°, indicating that tertiary alcohols are more reactive than secondary alcohols, which are in turn more reactive than primary alcohols.</p> Signup and view all the answers

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