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please explain C2H4 hybridization. Why can't carbon have a fourth bond with another carbon to satisfy the octet rule?
Dear Akshaya K.
Ethylene,H2C=CH2 is sp2 hybridised. Like you said,carbon atom certainly can have a fourth bond with another carbon atom if the carbon atom joining in has 3 bonds already satisfied by hydrogen atoms then the resulting molecule is propane,CH3-CH2-CH3 which is an alkane and which satisfies the octet rule. Otherwise each carbon atom in Ethylene,H2C=CH2 can be attacked by a hydrogen resulting in Ethane,C2H6 which also completes the 2n+2 rule making it an alkane and it satisfies the octet rule too.
But,Ethylene is unstable and for it to be stable and satisfy the octet rule it wants a fourth bond.
Hope you got it..!!
All the Very Best & Good Luck to you ...!
Best Regards,
AskIITians Expert,
Godfrey Classic Prince
IIT-M
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