What is molecular plane? And how to judge a molecular plane?

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Solution

Molecular plane is any plane which contains all the atoms. It exist only for planar molecules.
For example, in ethene, there are five sigma bonds in one plane: one C-C sigma bond and four C-H sigma bonds.
The pi bond is formed perpendicular to the plane in which one lobe of electron density is above the plane and one lobe of electron density is below the plane.
The nodal plane of the pi bond is in between the two lobes of electron density of the pi bond.
It's nodal plane of pi bond coincides with the molecular plane.
Thus, molecular plane can be seen with respect to the central atom, as all the atoms present are in the plane in case of ethane.
In case of tetrahedral geometry, i.e., $C H_{4}$ , only two atoms i.e., side atoms present along with the carbon in molecular plane.
Some of the examples are,

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