Why does O acquire a positive charge in the reaction

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Discussion Overview

The discussion revolves around the charge dynamics in a chemical reaction involving oxygen (O) and carbon (C), specifically addressing why O acquires a positive charge when a lone pair is used to form a bond. The scope includes conceptual understanding of charge conservation and electron transfer in molecular interactions.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why the use of a lone pair from O to form a bond with C results in a + charge on O, suggesting that it should lead to a 2+ charge instead.
  • Another participant asserts that the overall charge of the molecule remains unchanged, indicating that the charge has merely shifted rather than changed in total quantity.
  • A further participant inquires about the mechanism of charge shifting, explaining that the cationic carbon initially had a deficiency of one electron, which is compensated when it bonds with hydrogen, but questions the relevance of this to O.
  • One participant emphasizes the principle of charge conservation, stating that while charge localization can change, the total charge of the molecule remains constant unless electrons are lost or gained.

Areas of Agreement / Disagreement

Participants express differing views on the nature of charge shifts and the implications for the overall charge of the molecule, indicating that multiple competing perspectives remain without consensus.

Contextual Notes

There are unresolved questions regarding the specifics of charge localization and the relationship between the atoms involved in the reaction, as well as assumptions about electron transfer that are not fully articulated.

andyrk
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The reaction is shown in the image attached. So the lone pair over O goes into making a bond with C. But why does it create a + over O? A + means the number of protons are one more than electrons, or deficiency of 1 electron. But if the lone pair is used up for making a bond, shouldn't it result into a 2+ charge and not just a single +?
 

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You started with a cation, nothing has changed in terms of total number of protons of electrons - charge just shifted.
 
Why did the charge shift?
The cation (i.e the carbon atom) in beginning had deficiency of 1 electron. That's why it had a + charge on it. But when it forms a bond with H, it gets back the electron that it was short on and also gets another electron (as H carried 2 electrons with it on its way to C+) so as to fully complete its octet. How is that C even related to O which not even directly connected to it?
 
As long as the molecule is isolated, its charge can't change (this is the charge conservation at work). The only thing that can change is the charge localization on the molecule. When the electrons move between bonds/atoms, charge shifts - but it doesn't change. So if you start with a +1 molecules, it stays at +1 as long as it doesn't loose or accept an electron.
 

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