Molecular Orbital Theory

IMPORTANT

Molecular Orbital Theory: Overview

This topic covers concepts such as Molecular Orbital Theory, Differences between Atomic and Molecular Orbitals, Conditions for Combination of Atomic Orbitals to Form Molecular Orbitals, and Orientation of Combining Atomic Orbitals.

Important Questions on Molecular Orbital Theory

MEDIUM
IMPORTANT

The following pairs of compounds can be distinguished by which of the following tests:

 (i) Ethylamine and aniline

(ii) Aniline and N-methylaniline

MEDIUM
IMPORTANT

The number and type of bonds between two carbon atoms in calcium carbide are

MEDIUM
IMPORTANT

Which of the following species has four lone pairs of electrons?

                                                                                                                                                                                                                               

EASY
IMPORTANT

The bond order in   NO is 2.5 while that in   NO +  is 3. Which statement is true for these two species:

 

 

MEDIUM
IMPORTANT

The shape of an atomic orbital is determined by the type of the atomic orbital (s, p, d or f), while the shape of a molecular orbital is determined by the shapes of atomic orbitals that make the molecule.

EASY
IMPORTANT

Over lapping of 2p orbitals of two atoms forms how many molecular orbitals between two atoms?

EASY
IMPORTANT

Which of the following are the molecular orbitals formed from the overlapping of 1s atomic orbitals?

EASY
IMPORTANT

The energy level of an orbit is determined by the _____ value of that particular orbit.

HARD
IMPORTANT

Assertion. Molecular nitrogen is less reactive than molecular oxygen.

Reason. The bond length of N2 is shorter than that of oxygen

HARD
IMPORTANT

Assertion : H2 molecule is more stable than HeH molecule.

Reason : The anti bonding electron in the molecule destabilises it.

EASY
IMPORTANT

The bond formed in between boron atoms based on molecular orbital theory is 

EASY
IMPORTANT

The number of anti-bonding electrons in the beryllium molecule is

MEDIUM
IMPORTANT

Shape of px-orbital and s-orbital is _____ respectively.

MEDIUM
IMPORTANT

Atomic number of Cr, Fe and Co are 24, 26 and 27 respectively. Which of the following inner orbital octahedral complexes are paramagnetic?

MEDIUM
IMPORTANT

According to "Molecular orbital theory", which among the following diatomic molecules only has π-bonds?

MEDIUM
IMPORTANT

How many nodes are there in the anti-bonding molecular orbital formed by two 2s atomic orbitals?

EASY
IMPORTANT

In the molecular orbital diagram for the molecular ion N2+ , the number of electrons in the σ2p molecular orbital is

EASY
IMPORTANT

Stability of the species  Li 2 , Li 2 - and Li 2 +  increases in the order of

EASY
IMPORTANT

After understanding the assertion and reason, choose the correct option.

Assertion: In the bonding molecular orbital (MO) of H 2 , electron density is increased between the nuclei.
Reason: The bonding MO is ψA+ψB , which shows destructive interference of the combining electron waves.

EASY
IMPORTANT

If an extra electron is added to the hypothetical molecule C2, this extra electron will occupy the molecular orbital:-