Double bonds?
Answer:
single bond formation involves axial overlapping of orbitals.
if u consider itself as an atom it is the same thing as if someone is holding the tip of ur head so that the u can easily turn a twist & yes rotate urself. the same thing occurs in single bond formation too.
in double bonds the overlapping is lateral. if we apply the same logic as before, it's equivalent to someone holding both ur hands & legs. In such position none can turn . the same conclusion applies to the atoms forming double bonds too. so an atom involved in a double bond cant rotate.
Single bonds can rotate because the bond is axial. But a double bond cannot be axial -- there must be off-axis electrons. These prevent rotation.
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