what is SN2 AND SN3 hybridisation?

Please not that if we are considering hybridisation, then the correct terms are sp² and sp³. Following are the characteristics of sp² and sp³ hybridisation

• sp²

  • Involves mixing of one s orbital and two p orbitals to give three sp² orbitals
  • Hybrid orbitals have 33.33% s and 66.64% p character.
  • Three hybrid orbitals orient themselves in a trigonal planar fashion at an angle of 120°.
  • Example: B in BCl₃ undergoes sp² hybridisation.

• sp³

  • Involves mixing of one s orbital and three p orbitals to give four sp³ orbitals
  • Hybrid orbitals have 25% s and 75% p character.
  • Four hybrid orbitals orient themselves in such a manner that each orbital is directed toward the four corners of a tetrahedron.
  • Example: C in CH₄ undergoes sp³ hybridisation.