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Grade: 12
        
Sir what is coplanarity?
Is ethene is coplanar?
Difference between  planarity of ethene and Allene.
one year ago

Answers : (1)

Arun
24480 Points
							
Allene.... a compound where one carbon has two double bonds 

Propadiene 
H2C=C=CH2 
The C=C=C chain is linear because of the two double bonds. The central carbon exhibits sp hybridization and linear geometry. 

A better comparison is to propylene (1 double bond) where the molecule is bent at the central carbon, but all three carbon atoms are in a plane. The central carbon exhiibits sp2 hybridization and trigonal planar geometry. 
H3C−CH=CH2 

Ethylene is "planar" only when you include the hydrogen atoms. In ethylene there are only two carbon atoms which means that the carbon atoms must be linear.
one year ago
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