Consider the following statements.
S1 : Fluorine does not form any polyhalide because it does not have d-orbitals in valence shell.
S2 : In ClF3 , the three lone pairs of electrons occupy the equatorial position.
S3 : In B2 and N2 molecules mixing of s- and p- atomic orbitals takes place.
Of these statements :
Text Solution
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S1 : as it does not have d–orbitalsS2 : ClF3 
S3 : In B2 mixing of the 
g(2s) orbital with the 
g(2p) orbital lowers the energy of the 
g(2s) orbital and increases the energy of the 
g(2p) orbital to a higher level than the 
orbitals. As a result, the last two electrons are unpaired in the degenerate (having the same energy) 
orbitals, and the molecule is paramagnetic.
In N2 the 
g(2s) and 
g(2p) levels of N2 interact (mix) less than the B2 and C2 levels, and the 
g (2p) and 
u(2p) are very close in energy.
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