Valence-bond theory is one of the two quantum mechanical approaches that explains bonding in molecules In some cases, valence bond theroy cannot cannot satisfactorily account for observed properties of molecules
Consider the following molecular geometries
`{:(NO,,CO,,O_(2)):}`
Select correct statement`(s)` about these (More than one correct) .

Options

A. `NO` is paramagnetic `CO` and `O_(2)` are diamagnetic
B. `NO` and `O_(2)` are paramagnetic `CO` is diamagentic
C. Bond order is in order `O_(2) lt NO lt CO`
D. Number of unpaired electrons are
`{:(NO,,1,,),(CO,,0,,),(O_(2),,0,,):}`

Answer

B, C

Explanation

Bond order of `NO,O_(2)` and `CO` and `CO` are 1,2 and 0 respectively Hence `NO` and `H_(2)` are paramagnetic `CO` is diamagentic Statement (b) is correct .