Question

Correct order of lewis acidic strength is :

• A. $B{F}_3>BC{l}_3>BB{r}_3$
• B. $B{F}_3<BC{l}_3<BB{r}_3$
• C. $B{F}_3=BC{l}_3=BB{r}_3$
• D. $BB{r}_3>B{F}_3>BC{l}_3$

Answer 1

Answer: (B)

Extent of Back bonding $\propto \frac{1}{\text{ Size of halogen }}$
$\propto \frac{1}{\text{ Lewis Acid Strength }}$