Grade 12Physical Chemistry
Sir what is coplanarity?Is ethene is coplanar?Difference between planarity of ethene and Allene.
Sir what is coplanarity?
Is ethene is coplanar?
Difference between planarity of ethene and Allene.
1 Answer
Arun
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.
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.
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