Is C2H4 an Example of SP2 Hybridization?

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SUMMARY

C2H4, or ethene, is definitively an example of sp2 hybridization due to the presence of a double bond between the two carbon atoms. Each carbon atom in ethene forms three sigma bonds: two with hydrogen atoms and one with the other carbon atom, resulting in a total of three bonding groups. In contrast, C2H2, or acetylene, exhibits sp hybridization because it contains a triple bond between the carbon atoms. The confusion arises from the interpretation of bonding groups in hybridization theory, which can vary based on the perspective of the chemist.

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lokobreed
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In my take home study guide it says that C2H4 is an example of an SP2 hybridization... but when I draw out the electronic geometry I do not get a SP2 hybridization... am I doing something wrong or is my handout incorrect.

I get C2H2 as being an example of an SP2 hybridization
 
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Well, why would you say that the 2 C-atoms in acetylene are in sp_2 hybrid state ? As far as I know, they have a very stable triple bond between them and this is an sp hybridization.

Ethene C_2 H_4 has the 2 atoms of C in sp_2 hybrid state, as the bond between them is double.

These facts are high-school textbook material, though an explanation in terms of quantum mechanics is usually given in university.
 
perhaps i just don't understand this ... but wouldn't
H H
| |
H-C=C-H be 5 groups total or are you just counting each central atom by itself thus each C would have 3 groups resulting in an SP2 hybridization?
 
We're not on the same page. The C-atoms must have 4 bounds in all (because they must gather 8 electrons in the vecinity of their nucleus to get the most stable configuration), so that the structural formula for ethene MUST be H_2 C = CH_2. I don't know what you mean by groups.
 
right but as in groups i am saying that the double bond between the C=C is looked as one group not 2...
 
lokobreed said:
right but as in groups i am saying that the double bond between the C=C is looked as one group not 2...

150px-Ethylene-CRC-MW-dimensions-2D.png


Either carbon has three bonds: a bond to a hydrogen, a bond to a hydrogen, and a double bond to the other carbon. They're all counted as one, regardless of whether they're single, double, or tripe. 1+1+1=3=sp2 hybridized.
 

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