Why BF3 is a weak lewis acid?
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These F orbitals can overlap with the orbital on B, thereby increasing the electron density on the boron atom and making it less acidic.This effect is called backbonding, because electron density is leaving the more electronegative atom. ... Hence, the greater back bonding in BF3 makes it aweaker Lewis acid.
and In BCl3, the 3p orbitals on Cl are bigger than the 2p orbital on B, so orbital overlap is less efficient, and backbonding is less important.
and In BCl3, the 3p orbitals on Cl are bigger than the 2p orbital on B, so orbital overlap is less efficient, and backbonding is less important.
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