Which is the best reagent to convert cyclohexanol into cyclohexene?

c o n c . H C l

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c o n c . H B r

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conc.

H_{3} P O_{4}

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H C l + Z n C l_{2}

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Solution

The correct option is C conc. $H_{3} P O_{4}$
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 R-OH is a poor leaving group because it leaves as hydroxide ion. An acid is used to protonate the alcohol and form ${R - O H}_{2}^{+}$

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