Question

Back bonding in ${BF}_3$ does not affect :

• A. planarity, Lewis acidic strength and bond angle
• B. bond length, hybridisation and bond strength
• C. bond angle, planarity, geometry
• D. Lewis acidity, bond length, bond order (B - F).

Answer 1

Answer: (C)

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 $B{F}_3$ backbonding occurs and it doesn't change its planarity,bond angle and geometry.