1.

Give energy level diagram of molecular orbital obtained by overlapping of 2p_(x)^(1) orbital of two atoms .

Answer»

Solution :Two `2p_(x)` orbital are perpendicular & parallel to internuclear axes overlap and form`pi` MO. The energy level diagram is in given fig.

Where, AO = Atomic ORBITALS `(2p_(x)^(1))`
MO = Molecular orbitals `(pi 2p_(x) , pi^(**)2p_(x))`
BMO = Bonding orbitals `(sigma 2p_(x))`
ABMO = Antibonding orbitals `(sigma^(**)2p_(Z))`
Energy order : `pi 2p_(x) lt 2p_(x) lt pi^(**) 2p_(x)`
Note : (i) One electron of opposite spin in baoth `2p_(x)` or both ATOM.
(ii) BMO energy `lt ` ABMO energy, so according in high energy. to Aufbau and both electron in BMO and ABMO is empty.
`because ` the figure ofMO, `(pi 2p_(x)) and (pi^(**) 2p_(x))`which are form by LCAO of `2p_(x)` orbitals of two ATOMS are as under fig.

In `pi` TYPE BMO (+) and (-) waves are below and above of internuclear axis and electron density between two nucleus.
In `pi^(**)` type ABMO vertical nodal is located. Electron density is not between two nucleus. (+) and (-) waves are below and above the internuclear axis.


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