The best method to prepare cyclohexene from cyclohexanol is by using :

conc.

H_{3} P O_{4}

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conc.

H C l + Z n C l_{2}

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H B r

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conc.

H C l

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Solution

The correct option is D conc. $H_{3} P O_{4}$
The best method to prepare cyclohexene from cyclohexanol is by using conc. $H_{3} P O_{4}$ .

We can also use conc. sulphuric acid or alumina. A molecule of water is lost and $C = C$ double bond is formed.

Hence the correct option is A.

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Why is conc. HCl not used in place of conc. $H_{2} S O_{4}$ in the laboratory preparation of nitric acid?

H_{2} S O_{4.}

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C_{6} H_{12} O c o n . H_{2} S O_{4} - ----- \to C_{6} H_{10}

H C l / Z n {C l}_{2}

H C l

N a C l

H_{2} S O_{4}

H I

N a I

H_{2} S O_{4}

Z n C l_{2}

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