Which one of the following statements is incorrect about the structural properties of 
?
bonds is due to 
interaction between 
and 
atoms.
bond lengths are equal.
and 
are not isostructural molecules.
Text Solution
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has a trigonal planar structure, all three 
bonds lie in the same plane. Thus, the 
-orbitals of boron and fluorine become parallel. 
-orbital of boron is empty while fluorine has a lone pair. Fluorine donates its lone pair and this is called back bonding, or 
bond. Resonating structures can be obtained. Since, 
molecule is highly symmetrical, it has no dipole moment. All bonds are of equal length.
In Boron trihalides, the length of 
bond would be shorter than expected for a single bond, due to 
bonding. 
is also a trigonal planar molecule. Back bonding does not change the structure of the molecule. It simply decreases bond length 
and decreases Lewis acidity of 
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