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Alcohols, Phenols, and Ethers — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols, and Ethers1 Mark
MCQ
Which is the best reagent to convert cyclohexanol into cyclohexene?
  • A
    Conc.HCl
  • B
    Conc.HBr
  • C
    Conc. H3​PO4​
  • D
    HCl + ZnCl2​
     
✓

Answer

  1. Conc. H3​PO4

Explanation:

Cyclohexanol is used as substrate and phosphoric acid is present as catalyst which promotes the reaction but is not consumed in it. The hydroxyl group in R-OH is a poor leaving group because it leaves as hydroxide ion. An acid is used to protonate the alcohol and form $\text{R}−\text{OH}_2^+​$

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