What is planar and nonplanar in organic chemistry?
Answers
Explanation:
atoms which lie is same plane then planar .
if they are not then non planar
I think these general rules work:
If there is an sp3 hybridized carbon (or nitrogen), the molecular is NOT planar.
2) If there are no sp3 hybridized carbons (or nitrogens), and there is only one sp2 hybridized atom (carbon or nitrogen), it will be planar.
3) If there are no sp3 hybridized atoms, and there are 2 sp2 hybridized atoms (carbon or nitrogen) that are separated by an even number of double bonds and no single bonds, then the molecule will not be planar.
So a general simple rule is that:
the molecule will not be planar if there is an sp3 hybridized carbon (or nitrogen) atom or two sp2 hybridized atoms of carbon/nitrogen which are separated by an even number of double bonds and no single bonds. Otherwise, its structure allows it to be planar.
Even though the molecule will have a structure that allows for it to exist in a planar conformation, there may be some/many that do not persist in a planar conformation due to steric effects, or complex three dimensional geometries.
In the problems you listed above, using this rule:
Not planar because there are no sp3 and the two sp2s are separated by an even number of double bonds.
Planar because there are two sp2s but they are separated by an odd number of double bonds (3) (and no single bonds)
Planar because there are no sp3s and only 1 sp2s that make 3 or more bonds (C or N). The orbital geometry is NOT planar because the sp2 oxygen is separated from the sp2 carbon by an even number of double bonds.
Planar because 2 sp2s are separated by an odd number (1) of double bonds (and no single bonds)