Question

1. The molecular orbital theory is based on the principle of a linear combination of atomic orbitals. According to this approach when atomic orbitals of the atoms come closer, they undergo constructive interference as well as destructive interference giving molecular orbitals, i.e., two atomic orbitals overlap to form two molecular orbitals, one of which lies at a lower energy level (bonding molecular ort Each molecular orbital can hold one or two electrons in accordance with Pauli's exclusion principle and Hund's rule of maximum multiplicity. For molecules up to N2, the order of filling of orbitals is:

a(1s):(1s), a(2s):(2s), T (2p.) = r (2p,),0 (2p: ) (2pa)= (2p,),ở (2p:) and for molecules after N2, the order of filling is:

o(1s):(1s), o(2s); (28), o (2p), (2px)= (2py).* (2px)=* (2py), (2p)

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Bond order= (bonding electrons - antibonding electrons]

Bond order gives the following information:

1. If bond order is greater than zero, the molecule/ion exists otherwise not.

II. Higher the bond order, higher is the bond dissociation energy.

III. Higher the bond order, grater is the bond stability.

IV. Higher the bond order, shorter is the bond length.

Answer the following question:

i. Arrange the following negative stabilities of CN, CN* and CN in increasing order of

[Hint: Bond order:CN=944 = 2.5: CN- = 104 = 3 CN+ 8-4 = 2]

ii. The molecular orbital theory is preferred over valence bond theory. Why? ii. O, will have bond order than O2 and bond order _to H2

iv. In which set of molecules all the species are paramagnetic?

a. B2, O2. NZ

b. B2, O2. NO

c. B2. F2. O2

d. B2, O2, Liz

v. Bonding molecular orbital is lowered by a greater amount of energy than the amount by which antibonding molecular orbital is raised. (True/False). pls answer fast​

Answer 1

Answer:

]According to the molecular orbital theory He has two electrons in the outermost shell and thus it is chemically stable because it's duplet is complete. Hence it does not participate in the bond formation and molecule must have a bond to exist which is not in case of Helium.

Answer 2

Explanation:

The molecular orbital theory is based on the principle of a linear combination of atomic orbitals. According to this approach when atomic orbitals of the atoms come. closer, they undergo constructive interference as well as destructive interference.