Identify the correct statements regarding the phenomenon of back bonding. — Chemical Bonding Chemistry Question

💡 Solution & Explanation

Statement C is incorrect because Boron belongs to the 2nd period and lacks vacant d-orbitals; $BF_3$ exclusively exhibits $p\pi-p\pi$ back bonding. Statements A, B, and D accurately describe the conditions and physical consequences of back bonding (e.g., $N$ in $N(SiH_3)_3$ goes from $sp^3$ to $sp^2$).