1.

The sigma_(2s) orbital has a higher energy than sigma_(1s)^(**) orbital, sigma(_2s) orbital is bonding while sigma_(1s)^(**) orbital is antibonding because :

Answer»

`sigma_(2s)` is PLANAR while `sigma_(1s)^(**)` orbital.
`sigma_(2s)` is symmetrical while `sigma_(1s)^(**)` is UNSYMMETRICAL
`sigma_(2s)` is nearer to the NUCLEI than `sigma_(1s)^(**)`
none of these

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