A concept problem on organic chemistry

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Discussion Overview

The discussion revolves around the reactivity of alkanes, specifically their combustion with oxygen and the conditions under which they may be considered reactive or unreactive. Participants explore concepts related to activation energy and free radical processes, as well as contrasting views on the chemical stability of alkanes.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant states that alkanes are saturated hydrocarbons that are very unreactive but undergo combustion with oxygen.
  • Another suggests considering activation energy as a factor in understanding alkane reactivity.
  • A different participant challenges the notion that alkanes are unreactive, arguing that they are fairly reactive and providing examples of their use in laboratory settings.
  • One participant cites their textbook, which claims that alkanes do not react with acids, alkalis, dehydrating agents, or oxidizing/reducing agents, leading them to believe alkanes are chemically stable.
  • Another participant notes that combustion is a free radical process and asserts that alkanes do undergo free radical reactions.

Areas of Agreement / Disagreement

Participants express differing views on the reactivity of alkanes, with some arguing they are unreactive while others contend they are reactive in various contexts. The discussion remains unresolved regarding the overall classification of alkanes as reactive or unreactive.

Contextual Notes

There are references to activation energy and free radical processes, but the discussion does not resolve the implications of these concepts on the reactivity of alkanes. Additionally, the reliance on textbook definitions and examples from laboratory practices introduces potential limitations in understanding alkane behavior.

jeremy22511
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Alkanes are saturated hydrocarbons which are very unreactive.
However, they undergo combustion, i.e. they react with oxygen. Why?

(Even compounds as unreactive as polythene with over thousands of carbon atoms per molecule undergoes combustion...)
 
Chemistry news on Phys.org
Perhaps look into activation energy or similar?
 
Why says alkanes aren't reactive? Alkanes are fairly reactive, or we'd use PE instead of glassware in the lab.

Noble gases are unreactive. Nitrogen is fairly unreactive. PTFE is fairly unreactive. But alkanes? No. They react with all sorts of things.
 
But my textbook says they don't react with acids, alkalis, dehydrating agents, O.A., R.A. etc. It was this that gave me the idea that alkanes are chemically stable...
Can anyone help me? Thanks.

J
 
Fire is a free radical process and alkanes DO undergo free radical reactions.
 

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