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In the elimination of reactions, that is...

In the elimination of reactions, that is, in the formation of alkenes, the reactivity of halogens in alkyl halides in the the order-

A

I`gt`Br`gt`Cl

B

Cl`gt`Br`gt`I

C

Br`gt`Cl`gt`I

D

None

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The correct Answer is:
A
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When haloalkanes with beta -hydrogen atom are boiled with alcoholic solution of KOH, they undergo elimination of hyarogen halide resulting in the formation of alkenes. These reactions are called beta -elimination reactions or dehydrohalogenation reactions. These reactions follow Saytzeff's rule. Substitution and elimination reactions often compete with each other. Mostly bases behave as nucleophiles and therefore can engage in substitution or elimination reactions depending upon the alkyl halide and the reaction conditions. In the elimination reactions, the reactivity of alkyl halides follow the sequence

BANSAL-HYDROCARBONS-Exercise 1
  1. Which of the following compound undergoes dehydrochlorination most eas...

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  2. In the sequence of reactions, CH(3)CH(2)CH(2)Ohoverset(PCl(5))toAunder...

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  3. In the elimination of reactions, that is, in the formation of alkenes,...

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  4. The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is-

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  5. Ethyl chloride on heating with alcoholic potash gives:

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  6. The ease of dehydration of an alcohol with concentrated H(2)SO(4) is

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  7. Consider the following reaction the major alkene product is (CH(3))(3...

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  8. The dehydrohalogenation of 2-bromobutane with alcoholic KOH gives-

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  9. The main product produced in the dehydrohalogenation of 2-bromo-3,3-di...

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  10. The structural formula of the compound which yields ethylene upon reac...

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  11. Alcohols undergo dehydration in the following sequence

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  12. A is-

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  13. On heating n-propyldimethylamine oxide, propene is obtained. The react...

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  14. The most common reactions of alkenes are-

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  15. The reaction CH(2)=CHCH(3)=HBr to CH(3)CHBrCH(3) is-

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  16. Anti-Markownikoff's addition of HBr is not observed in-

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  17. The addtion of Br(3) to trans-2-butene produces

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  18. The addition of HCl in the presence of peroxide does not follow anti-M...

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  19. The ozonolysis of an olefin gives only propanone. The olefin is:

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  20. 3-Methyl-2-pentene on reaction with HOCl gives-

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