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Valence Bond Theory

30. Which orb...

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30. Which orbital overlap is strongest? 2p,-2p, overlap 2s- 2s overlap sp -2p p,-p,overlap

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2 s - 2 s, 2 p - 2 p

2 p - 2 s

orbitals overlap, the bond strength decreases in the order:

The strength of bonds formed by 2s - 2s, 2p - 2p and 2p - 2s overlap has the order:

Which of the following statements about overlap integrals of the various orbital is true -

1)2p>2s>2sp^3>2sp^2>2sp

2)2p>2sp^3>2sp^2>2sp>2s

3)2p>2sp>2sp^2>2sp^3>2s

4)2sp^3>2sp^2>2sp>2p>2s

Q. The formation of a double bond in an oxygen molecule is explained below. Arrange the given points in a sequential order.
(a) 2p

_{y}

orbitals of each oxygen atom overlap laterally/sidewise to form a pi bond.
(b) Thus, a double bond between two oxygen atoms in which one p

_{z}

_{z}

sigma bond and p

_{y}

_{y}

π

bond is formed.
(c) All the three 2p orbitals are perpendicular to each other. Hence 2p

_{z}

orbitals of each oxygen atom overlap end to end to form a sigma bond.
(d) The electronic configuration of oxygen is

O

^{2}

^{2}

_{x}^{1}

_{y}^{2}

_{z}^{1}

Q. In sp-hybridisation, one s-orbital overlaps with two p-orbitals.

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