CBSE Class 12-science Answered
Why NO does not dimerise even it has odd electron?
Asked by ranvirsingh1as | 16 Dec, 2018, 10:47: PM
Expert Answer
In the NO molecule, there are 11 valence electrons having a set of 5 electrons of one spin and 6 electrons of the opposite spin.
Both the sets have a tetrahedral orientation around the two atoms.
But the dimeric form of NO molecule is not possible due to the following reasons:
- As per the thermodynamic point of view, entropy is in favour of small molecules,
- Dimerisation takes place if there is some gain in bonding. But in the dimerisation of NO, there is no gain of electrons because the bond order of 2 ½ remains the same in the dimer.
- Hence, the dimer is unstable relative to the monomer in case of NO.
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