Hybridization state and geometry of the central carbon atom in H − C ≡ N has to be identified. Concept Introduction: According to VSEPR (Valence Shell Electron Pair Repulsion) theory, each molecule gets a unique structure. That structure is explained by considering steric number of that molecule. The geometry of the central atom will be determined by counting the steric number followed by the hybridization state of that central atom and finally electronic arrangement of atoms in space. The steric number is the combination of both number of σ -bonds and number of lone pairs involved in a particular molecule. If the steric number is 4, the central atom is sp 3 hybridized and the electronic arrangement of atoms in space (i.e. geometry) will be tetrahedral. If the steric number is 3, the central atom is sp 2 hybridized and the electronic arrangement of atoms in space (i.e. geometry) will be trigonal planar. If the steric number is 2, the central atom is sp hybridized and the electronic arrangement of atoms in space (i.e. geometry) will be linear. s p 3 hybridized = tetrahedral trigonal pyramidal(if one lone pair of electron is present) bent geometry (if two lone pair of electrons are present) s p 2 hybridized = trigonal planar s p hybridized = linear

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Chapter 1, Problem 74IP

Interpretation Introduction

Interpretation:

Hybridization state and geometry of the central carbon atom in H−C≡N has to be identified.

Concept Introduction:

According to VSEPR (Valence Shell Electron Pair Repulsion) theory, each molecule gets a unique structure. That structure is explained by considering steric number of that molecule.

The geometry of the central atom will be determined by counting the steric number followed by the hybridization state of that central atom and finally electronic arrangement of atoms in space.

The steric number is the combination of both number of σ -bonds and number of lone pairs involved in a particular molecule.

If the steric number is 4, the central atom is sp³ hybridized and the electronic arrangement of atoms in space (i.e. geometry) will be tetrahedral.

If the steric number is 3, the central atom is sp² hybridized and the electronic arrangement of atoms in space (i.e. geometry) will be trigonal planar.

If the steric number is 2, the central atom is sp hybridized and the electronic arrangement of atoms in space (i.e. geometry) will be linear.

sp3 hybridized =    tetrahedral

  trigonal pyramidal(if one lone pair of electron is present)

  bent geometry (if two lone pair of electrons are present)

sp2 hybridized =    trigonal planar

sp hybridized =    linear

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