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Which of the ...

Question

Which of the following statements is not true regarding molecular orbital theory?

A

The atomic orbitals of comparable energies combine to form molecular orbitals.

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B

An atomic orbital is monocentric while a molecular orbital is polycentric.

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C

Bonding molecular orbital has higher energy than antibonding molecular orbital.

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D

Molecular orbitals like atomic orbitals obey Aufbau principle for filling of electrons.

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Solution

The correct option is C Bonding molecular orbital has higher energy than antibonding molecular orbital.
The arrangement of bonding molecular orbitals and anti-bonding molecular orbitals is given in the image. It is clear that the bonding molecular orbital has lesser energy and more stability than anti-bonding molecular orbitals.
So the correct option is [C].

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Similar questions

Q. According to MOT, two atomic orbitals overlap resulting in the formation of molecular orbitals. Number of atomic orbitals overlapping together is equal to the molecular orbital formed. The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the same phase or in the different phase are known as bonding and antibonding molecular orbitals respectively. The energy of bonding molecular orbital is lower than that of the pure atomic orbital by an amount

Δ

. This known as the stabilization energy. The energy of antibonding molecular orbital is increased by

Δ^{'}

(destabilization energy).
Which of the following statement(s) is(are) true:

Q. According to MOT (Molecular Orbital Theory), the molecular orbitals are formed by mixing of atomic orbitals through LCAO (linear combination of atomic orbitals). The correct statement (s) about molecular orbitals is/are Statement (a) : bonding molecular orbitals are formed by addition of wave-functions of atomic orbitals of same phase Statement (b) : anti-bonding molecular orbitals do not take part in bond formation because they belong to inner shells Statement (d) : anti-bonding molecular orbitals provide stability to molecules while bonding molecular orbitals make the molecules unstable.

Q. According to MOT, two atomic orbitals overlap resulting in the formation of molecular orbitals. Number of atomic orbitals overlapping together is equal to the molecular orbital formed. The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the same phase or in the different phase are known as bonding and antibonding molecular orbitals respectively. The energy of bonding molecular orbital is lower than that of the pure atomic orbital by an amount

Δ

. This known as the stabilization energy. The energy of antibonding molecular orbital is increased by

Δ^{'}

(destabilization energy).
How many nodal plane(s) is/are present

σ_{(s and p)}

in bonding molecular orbital?

Q. When two atomic orbitals combine, energy of bonding molecular orbital is lowered by

x

while that anti bonding molecular orbital is raised by

y

Q. If the total energy of the two atomic orbitals is

x

and the energy difference between bonding and antibonding molecular orbitals is

y

then the energy of bonding and anti-bonding molecular orbital will be:

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