The differences between sigma bond and pie bond - QS Study
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The differences between sigma bond and pie bond are given as follows:

Sigma Bond

  1. A sigma bond is formed by the end to end overlap of half filled atomic orbitals along the inter-nuclear axis.
  2. Sigma bond containing compound is less active.
  3. The molecular orbital is symmetrical about the inter-nuclear axis.
  4. There can be free rotation of atoms around the sigma bond.
  5. The bond may be representing between two atoms either along or pie bond.
  6. In formation of sigma bond s-orbital can participate.
  7. Sigma bond containing compound generally gives substitution reaction.
  8. In this case overlapping can take place to a large extent.

Pie Bond

  1. Pie bond is formed by the side wise overlap of two half filled p-orbitals.
  2. Pie bond containing compound is more active.
  3. The molecular orbital is discontinuous and consists of two charged clouds above and below the plane of atoms.
  4. Free rotation of atoms around pie bond is not possible.
  5. The bond is always present between two atoms in addition to sigma bond.
  6. In formation of pie bond s-orbital cannot participate.
  7. Pie bond containing compound generally gives addition reaction.
  8. In the formation of pie bond overlapping occurs to a lesser extent.