Is it true you can only add H to an alkene?

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    Alkene
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Discussion Overview

The discussion revolves around the reactions involving alkenes, specifically focusing on hydrogenation and whether it is possible to reverse this process through dehydrogenation. Participants explore the nature of these reactions and their reversibility in the context of organic chemistry.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions whether hydrogenation can only add hydrogen to alkenes, referencing their textbook's treatment of the topic.
  • Another participant counters that hydrogenation is not the only reaction possible, citing examples of ethene reacting with halogens.
  • A participant clarifies that they are specifically asking about the reversibility of hydrogenation, leading to a discussion about dehydrogenation.
  • A later reply confirms that dehydrogenation is indeed possible, providing a specific reaction example involving a platinum catalyst.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the initial question regarding the exclusivity of hydrogen addition to alkenes, as differing viewpoints on the types of reactions and their reversibility are presented.

Contextual Notes

The discussion includes assumptions about the definitions of hydrogenation and dehydrogenation, as well as the conditions under which these reactions occur, which are not fully explored.

kingdomof
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My textbook introduces the reaction of catalyzed Hydrogenation and later on in the chapter states that all reactions have the ability to proceed forward or backward, yet in the elimination reactions chapter they do not mention this reaction.

So, is it true?
 
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No that's not true.
In many textbooks there are examples of ethene undergoing an addition reaction with a halogen.
 
No I meant to say is it possible to reverse Hydrogenation.
 
Oh sorry.
Dehydrogenation you mean?
Yes it is possible by this reaction:

CH3-CH2-CH3 + heat ----> CH2=CH-CH3 + H2

using a platinum catalyst.

:smile:
 

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