1. Tardigrade
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  4. Assertion: Rotation about C=C is restricted. Reason: Electron charge cloud of the π bond is located above and below the plane of bonding atoms.

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Q. Assertion : Rotation about $C=C$ is restricted.
Reason : Electron charge cloud of the $\pi$ bond is located above and below the plane of bonding atoms.

Organic Chemistry – Some Basic Principles and Techniques

Solution:

In a $\pi$ bond formation, parallel orientation of the two $p$ orbitals on adjacent atoms is necessary for proper sideways overlap. The $p$ orbitals are mutually parallel and both the $p$ orbitals are perpendicular to the plane of the molecule. Rotation of one $CH_{2}$ fragment with respect to other, interferes with maximum overlap of $p$ orbitals and hence such rotation is restricted.