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B
bond length, hybridisation and bond strength
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C
bond angle, planarity, geometry
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D
Lewis acidity, bond length, bond order (B - F).
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Solution
The correct option is B bond angle, planarity, geometry
π backbonding, also called π backdonation, is a concept from chemistry in which electrons move from an atomic orbital on one atom to an appropriate symmetry antibonding orbital on a π-acceptor ligand. Electrons from the metal are used tobond to the ligand, in the process relieving the metal of excess negative charge.
In BF3 backbonding occurs and it doesn't change its planarity,bond angle and geometry.