The best method to prepare cyclohexene from cyclohexanol is by using

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Conc. HCI + ZnCl₂

HBr

Conc. H₃PO₄

Conc. HCI

answer is C.

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Detailed Solution

Because conc. H₃PO₄ acts as a dehydrating agent.

Note: HCl, HBr and conc. HCl + ZnCl₂ all are nucleophiles, thus convert alcohols to alkyl halides. However, conc. H₃PO₄ is a good dehydrating agent which converts an alcohol to an alkene.

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