How do alkenes react with sulphuric acid? Discuss its mechanism.

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 Multiple Choice QuestionsLong Answer Type

151.

Discuss the free radical mechanism of addition of HBr to propene.
Or
Give the mechanism of addition of HBr to propylene in the presence of peroxide.

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152. Write IUPAC names of the products obtained by addition reactions of HBr to hex-1-ene:
(i) in the absence of peroxide and
(ii) in the presence of peroxide.

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153.

The addition of HBr to propene yields 2-broniopropane, while in the presence of benzoyl peroxide, the same reaction yields 1-bromopropane. Explain and give mechanism. 

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 Multiple Choice QuestionsShort Answer Type

154.

Why peroxide effect is shown only by HBr and not by HCl or HI?
Or
Explain why Kharasch effect is shown by HBr only and not by HCl or HI.

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 Multiple Choice QuestionsLong Answer Type

155. Discuss the mechanism of formation of halohydrin.
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156.

How do alkenes react with sulphuric acid? Discuss its mechanism.


Alkenes react with the sulphuric acid in cold to form alkyl hydrogen sulphates. The addition in case of unsymmetrical alkenes proceeds according to Markownikov's rule. 



Mechanism: It involves electrophilic addition reaction and consists of the following two steps:

(i) Electromeric effect and electrophilic attack:





(ii) Attack of nucleophile: The nucleophile released in the slow step combines with carbocation to give ethyl hydrogen sulphate.




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 Multiple Choice QuestionsShort Answer Type

157.

Write a short note on hydroboration oxidation.

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 Multiple Choice QuestionsLong Answer Type

158.

What is ozonolysis? What is its significance?

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 Multiple Choice QuestionsShort Answer Type

159.

Write IUPAC names of the products obtained by the ozonolysis of the following compounds:
Pent - 2-ene 

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160.

Write IUPAC names of the products obtained by the ozonolysis of the following compounds:
 3, 4-Dimethlhept-3-ene

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