The correct order of Lewis acidity for BX_3 i | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The Lewis acidity of boron trihalides $(BX_3)$ depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom. In $

Vedclass · Accepted Answer

$BF_3 < BCl_3 < BBr_3 < BI_3$

Vedclass · Answer

(A) The Lewis acidity of boron trihalides $(BX_3)$ depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom. In $BF_3$,the fluorine atom has a small size and its $2p$ orbitals effectively overlap with the empty $2p$ orbital of boron,leading to strong back-bonding. As the size of the halogen increases from $F$ to $I$,the effectiveness of $p\pi-p\pi$ back-bonding decreases $(F > Cl > Br > I)$. Since back-bonding reduces the electron deficiency of the boron atom,the Lewis acidity increases as the back-bonding decreases. Therefore,the correct order of Lewis acidity is $BF_3 < BCl_3 < BBr_3 < BI_3$.

The correct order of Lewis acidity for $BX_3$ is:

Similar Questions

What is the nature of $Al_2O_3$?

Boron compounds act as Lewis acids due to .....

$2BF_3 + 6NaH \xrightarrow{450 \ K} X_{(g)} + 6NaF$. Which of the following statements is \textbf{Incorrect} for $X$?

Which of the following is the weakest acid?

Write balanced chemical equations for the following reactions:
$(i)$ $BF_3 + LiH \rightarrow$
$(ii)$ $B_2H_6 + H_2O \rightarrow$
$(iii)$ $NaH + B_2H_6 \rightarrow$
$(iv)$ $H_3BO_3 \xrightarrow{\Delta}$
$(v)$ $Al + NaOH \rightarrow$
$(vi)$ $B_2H_6 + NH_3 \rightarrow$

Vedclass Test Series

Exam Paper Generator

Online Exam Module