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The best method to prepare cyclohexene f...

The best method to prepare cyclohexene from cyclohexanol is by using

A

`"Conc. "HCl+ZnCl_(2)`

B

`"Conc. "H_(3)PO_(4)`

C

`HBr`

D

`"Conc. "HCl`

Text Solution

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The correct Answer is:
B
Conc. `HCl, HBr and " conc. "HCl+ZnCl_(2)` all are nucleophiles, thus cunvert alcohols to alkyl halides. However, conc. `H_(3)PO_(4)` is a good dehydrating agent which converts an alcohol to an alkene.
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DISHA PUBLICATION-ALCOHOLS, PHENOLS AND ETHERS-Exercise - 1 : Concept Builder (Topicwise)(TOPIC 2 : Preparation and Properties of Alcohols)
  1. Reagent used to convert allyl alcohol to acrolein is :

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  2. HBr reacts fastest with

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  3. The best method to prepare cyclohexene from cyclohexanol is by using

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  4. Acid catalysed hydration of alkenes except ethene leads to the formati...

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  5. Which of the following reagent will convert glycerol to acrolein ?

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  6. Which of the following alcohols is least soluble in water ?

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  7. Which of the following will not give iodoform test?

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  8. Ethyl alcohol can be prepared from grignard reagent by the reaction of...

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  9. Glycerol is more viscous than ethanol due to :

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  10. Ethanol and dimethyl ether from a pair of functional isomers. The boil...

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  11. When glycerol is treated with excess of Hl, the product formed is……………...

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  12. Which of the following compounds can be used as antifreeze in automobi...

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  13. In the following sequence of reaction, the product C is CH(3)-Br ove...

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  14. Number of isomeric alcohols of molecular fomula of C(6)H(14)O which g...

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  15. Which of the following reaction(s) can be used for the preparation of ...

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  16. Which of the following is not the product of the dehydration of ?

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  17. The compound X is

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  18. Which carbocation is more likely to be formed in the dehydration of

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  19. Major product is

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  20. The above reaction is an example of

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