1.

Which of the following M.Os. Containing electron/electrons has highest energy in B_(2) molecule ?

Answer»

`sigma 2s`
`sigma 2 p_(Z)`
`PI 2 p_(x)`
`sigma^(**)2s`.

Solution :Electronic configuration of `B_(2)` is : `(sigma 1s)^(2)(sigma^(**)1s)^(2)(sigma 2s)^(2)(sigma^(**)2s)^(2)(pi 2p_(x))^(1)(pi 2PY)^(1)`


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