Saved Bookmarks
| 1. |
Which are the type of molecular orbitals ? Give information in short. |
|
Answer» Solution :Molecular orbitals of DIATOMIC molecules are designated or `SIGMA `(sigma), `pi` (Pi) `delta` (Delta) etc. `sigma `(sigma) molecular orbitals: The sigma `(sigma)` molecular orbitals are symmetrical around the bond axis. e.g. `sigma_(1s) and sigma_(1s)` : The linear combination of 1s orbitals centered on two nuclei produces two molecular orbitals which are symmetrical around the bond-axis. Such molecular orbitals are of the o type and are DESIGNED as ols and `sigma` 1 s and `sigma^(**)` eg. `sigma 2p_(z)` and `sigma^(**)2p_(z)`:If internuclear axis is taken to be in the Z-direction, it can be seen that a linear combination of `2p_(z)` orbitals of two atoms also produces two sigma molecular orbitals designated or `sigma (2p_(z)), sigma^(**) (2p_(z)) sigma (1s), sigma^(**) (1s), sigma(2s), sigma^(**) , sigma(2p_(z)) , sigma^(**)(2p_(z))` are `sigma` types ad symmetrical around the bond axis. `pi and pi^(**)` types molecular orbitals : The `pi` molecular orbitals are not symmetrical around the bond axis because in these above and below the bond axes (+) and (- ) symbol are not symmetrical. Molecular orbitals obtained form`2p_(X) and 2p_(y)` orbitals are not symmetrical around the bond axis because of the presence of positive lobes above and negative lobes below the molecular plan. Such molecular orbitals are labelled as `pi and pi^(**)` . A `pi` bonding MO has larger electron density above and below the inter NUCLEAR axis. The `pi^(**)` antibonding MO has a node between the nuclei. |
|