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Hell-Volhard-Zelinski Reaction

The dehydrati...

Question

The dehydration of 1-butanol in presence of catalytic amount of concentrated $H_{2} S O_{4}$ gives:

A

1-butene as the main product

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B

2-butene as the main product

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C

equal amounts of 1-butene and 2-butene

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D

2- methylpropene

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Solution

The correct option is B 2-butene as the main product

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Similar questions

Q. Assertion :2-Butanol on heating with

H_{2} S O_{4}

gives 1-butene and 2-butene. Reason: Dehydration of 2-butanol follows Saytzeff rule.

There are some compounds which are as follow:

1-phenyl-1-butene, 1-phenyl-2-butene, 2-phenyl-1-butene

Which of the following is the correct order for increasing order of reactivity for acid catalyzed hydration?

1) 1-phenyl-1-butene < 1-phenyl-2-butene < 2-phenyl-1-butene

2) 1-phenyl-2-butene < 1-phenyl-1-butene < 2-phenyl-1-butene

3) 2-phenyl-1-butene < 1-phenyl-2-butene < 1-phenyl-1-butene

Q. Formation of 2-butene as major product by dehydration of 2-butanol is according to :

2

-Bromobutane on reaction with sodium ethoxide in ethanol gives

1

-butene as a major product. Reason:

1

-Butene is more stable than

2

Q. A mixture of two alcohols

3 -

- 1 -

2 -

- 1 -

butanol, given chiefly

2 -

- 2 -

butene when dehydrated with acid.

2 -

- 2 -

butene is converted into

2 -

- 2 -

butanol with approximately 90% yield by treatment with 50% aqueous solution of sulphuric acid at

0^{\circ}

C. Write equation showing mechanism of conversions.

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Hell-Volhard-Zelinski Reaction

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