1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion (A) In H 2 C == CH 2 molecule, the rotation about carbon-carbon double bond ( C == C ) is restricted Reason (R) Rotation of one CH 2 fragment with respect to other interferes with maximum overlap of p-orbitals.

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Q. Assertion (A) In $H _{2} C == CH _{2}$ molecule, the rotation about carbon-carbon double bond $( C == C )$ is restricted
Reason (R) Rotation of one $CH _{2}$ fragment with respect to other interferes with maximum overlap of $p$-orbitals.

Organic Chemistry – Some Basic Principles and Techniques

Solution:

In $CH _{2}== CH _{2}$ molecule, all the atoms must be in the same plane. The $p$-orbitals are mutually parallel and are perpendicular to the plane of the molecule.
Rotation of one $- CH _{2}$ fragment with respect to other interferes with maximum overlap of $p$-orbital and therefore such rotation about $C == C$ bond is restricted. Thus, both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.