MCQ
Which is the best reagent to convert cyclohexanol into cyclohexene?
- AConc$.\text{HCl}$
- BConc$.\text{HBr}$
- ✓Conc. $\mathrm{H}_3 \mathrm{PO}_4$
- D$\mathrm{HCl}+\mathrm{ZnCl}_2$
✓
Answer
Correct option: C.
Conc. $\mathrm{H}_3 \mathrm{PO}_4$
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 $\ce{R-OH}$ 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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