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Unsymmetrical ethers are best prepared b...

Unsymmetrical ethers are best prepared by-

A

Williamson's continuous etherification process

B

Reacting grignard reagent with alkyl halide

C

Treating sodium alkoxides with alkyl bromides

D

Heating an alkanol with conc. `H_(2)SO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
C
`R-Br+overset(o+)(N)aoverset(ө)(O)R^(1)to underset("Unsymmetrical ether")(R-O-R^(1)+NaBr)`
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Ethers can be prepared by :

Ethers can not be prepared by :

Alexander Williamson prepared diethyl by a simple method, now called as Williamson's ether synthesis . In this method, an alkyl halide is treated with sodium alkoxide prepared from sodium and alcohol. This reaction is used in the synthesis of symmetrical and unsymmetrical ethers. It may be noted taht for preparing unsymmetrical ethers, the halide used should preferably be primary because secondary and tertiary alkyl halides may form alkenes as major product due to elimination process. CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Br+underset("Sodium ethoxide")(Na^(+)O^(-)-C_(2)H_(5))rarrunderset("2-methylpropene")(CH_(3)-overset(CH_(3))overset(|)(C)=CH_(2))+C_(2)H_(5)OH+NaBr Aryl ethers or phenolic ethers can be prepared by using sodium phenoxide and alkyl halides. However, aryl halides and sodium alkoxide cannot be used for preparing phenolic ethers because aryl halides are less reactive towards nucleophilic substitution reaction Methyl tertiary butyl ether (MTBE) is added in gasoline to improve its octane number . CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-O-CH_(3) Which of the following is the best method for synthesis of the above ether ?

Phenolic ethers (alkaryl ethers, ArOR ) are prepared by

Allyl phenyl ether can be prepared by heating:

BANSAL-ALCOHOL, ETHERS & PHENOL, OXIDATION & REDUCTION -Exercise 1
  1. The decomposition of ethers by KI or HBr is called-

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  2. Ether is not formed in this reaction-

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  3. Unsymmetrical ethers are best prepared by-

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  4. Which of the followig is used as an additive by fire departments under...

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  5. In the Williamson's synthesis for diethyl ether, which species workds ...

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  6. The structure of the compounds formed by the the reaction of diethyl e...

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  7. Ether bottles should not be kept open in air because-

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  8. Isopropyl alcohol vapour is passed over alumina heated at about at abo...

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  9. Which of the following is not expected to give ether on reaction with ...

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  10. Consider the following reactions CH(3)CH=CH(2)overset(1.(CH(3)COOH)(...

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  11. What is the end product 'B' of following sequence of reaction? C(6)H...

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  12. What are the final products of the following sequence of reactions? ...

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  13. Phenol is obtained in large scale from which fraction of coal-tar?

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  14. By which of the following reactions phenol can be prepared industriall...

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  15. The compound obtained by heating cumenehydroperoxide with dil. H(2)SO(...

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  16. The product of the reaction of benzene with oxygen in the presenec of ...

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  17. Dow's process used in the industrial preparation of phenol, is-

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  18. Benzo radical in the following is-

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  19. Next higher homologue of phenol is-

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  20. Which of the following is not a phenolic compound-

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