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Grade: 12

                        

Sir what is coplanarity? Is ethene is coplanar? Difference between planarity of ethene and Allene.

2 years ago

Answers : (1)

Arun
25333 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.
2 years ago
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