Question

Match the following

$\begin{array}{ccc}\text{1.}PC{l}_3& \text{a. 2 lone pairs}& \text{A. 5 Ligands}\\ \text{2.}Cl{F}_3& \text{b. 3 lone pairs}& \text{B. 3 Ligands}\\ \text{3.}Xe{F}_6& \text{c. 0 lone pairs}& \text{C. 6 Ligands}\\ \text{4.}SbC{l}_5& \text{d. 1 lone pairs}& \text{D. 4 Ligands}\end{array}$

• A. 1 - b, C; 2 - b, B; 3 - a, A, 4 - a, A
• B. 1 - d,B; 2 - a,B; 3 - d,C; 4 - c, A
• C. 1 - b, B; 2 - b, C; 3 - b, B, 4 - a, A
• D. 1 - c, B; 2 - a, C; 3 - a, B, 4 - a, B

Answer 1

The correct option is B

1 - d,B; 2 - a,B; 3 - d,C; 4 - c, A

Lets calculate the ep values first:

ep = $\frac{(V+L+A-C)}{2}$

(1) $PC{l}_3\Rightarrow \frac{(5+3)}{2}=4\Rightarrow$ 1 lone pair

(2) $Cl{F}_3\Rightarrow \frac{(7+3)}{2}=5\Rightarrow$ 2 lone pair

(3) $Xe{F}_6\Rightarrow \frac{(8+6)}{2}=7\Rightarrow$ 1 lone pair

(4) $SbC{l}_5\Rightarrow \frac{(5+5)}{2}=5\Rightarrow$ 0 lone pairs