Question

BF3 readily reacts with SO3

Answer 1

Answer:

answer soon. As BF3 is a Lewis acid and NH3 is a Lewis base, NH3 donates its lone pair to BH3 and forms a dipolar bond. NH3 gets a positive formal charge and BH3 gets a negative formal charge and adduct is formed.

Answer 2

NH3 is an electron rich with a lone pair on nitrogen and so is always ready to co-ordinate this lone pair to other species

while bh3 is an electron deficient species with an incomplete octet of Boron . so bh3 is always looking for species which can donate electron to eat it and complete it octet of Boron .

so clearly bh3 and NH3 get together NH3 coordinates its lone pair to the empty P-shell of the Boron forming a co-ordinate Bond to give rise to an adduct