Valence Bond Theory

Heitler and London introduced which theory?

• Valence Bond Theory

• Covalent Theory

• Molecular Orbital Theory

• VSEPR Theory

s-s overlap is a _______

• σBond

• πBond

Why xenon, Xe can formed bond with fluorine to form XeF₂ and XeF₄ compounds?

• The electrons in p-orbital promoted to d-orbitals

• The Xe atom has lower electronegativity

• Empty d orbitals is available

• High nuclear charge of Xe atom

Choose the central atom in the molecule below which does not undergo sp³ hybridization.

• H₂O

• ClF₃

• NH₃

• CH₄

The purpose of promoting one or more electrons in the process of forming hybrid orbitals is ___________________

• to increase the number of unpaired electrons

• to increase the number of orbital

• to make orbital have same the shape and energy

• to use the empty d-orbitals

Which is the stronger bond?

• σBond

• πBond

Choose all the old attractive force(s) (ie. when atoms are isolated)

• N_{A -} N_B

• N_A - E_A

• N_B - E_B

• N_B - E_A

• N_{A -} E_B

Two carbon atoms form a linear shaped ethene, C₂H₄, molecule when bonded with four other hydrogen atoms. Prior to bonding, the carbon atom

• undergoes sp hybridisation

• does not hybridise

• undergoes sp³ hybridisation

• undergoes sp² hybridisation

px - px overlap (perpendicular to internuclear axis) is a _______

• σBond

• πBond

A π (pi) bond is the result of the

• sidewise overlap of two parallel p orbitals

• overlap of two s orbitals

• sidewise overlap of two s orbitals

• overlap of an s orbital and a p orbital

• overlap of two p orbitals along their axes