Question

Which of the following sets are correctly matched?

Sl. No.	Molecules	Number of lone pairs of electrons on central atom
I	\(\mathrm{SO_2,\ PbCl_2,\ SF_4}\)	\(1\)
II	\(\mathrm{XeF_4,\ H_2O,\ BrF_3}\)	\(2\)
III	\(\mathrm{CCl_4,\ XeF_6,\ IF_7}\)	\(0\)

The correct answer is

• A. I, II only
• B. I, II, III
• C. I, III only
• D. II, III only

Hint:

Remember the lone pairs on the central atom: \[ \boxed{ \begin{aligned} \mathrm{SF_4} &: 1, \mathrm{XeF_4} &: 2, \mathrm{BrF_3} &: 2, \mathrm{XeF_6} &: 1, \mathrm{IF_7} &: 0. \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Check Set I.& nbsp;

\[ \begin{aligned} \mathrm{SO_2} & amp;\rightarrow 1\ \text{lone pair},\\ \mathrm{PbCl_2} & amp;\rightarrow 1\ \text{lone pair},\\ \mathrm{SF_4} & amp;\rightarrow 1\ \text{lone pair}. \end{aligned} \]

Hence, Set I is correct.

Step 2: Check Set II.

\[ \begin{aligned} \mathrm{XeF_4} & amp;\rightarrow 2\ \text{lone pairs},\\ \mathrm{H_2O} & amp;\rightarrow 2\ \text{lone pairs},\\ \mathrm{BrF_3} & amp;\rightarrow 2\ \text{lone pairs}. \end{aligned} \]

Hence, Set II is also correct.

Step 3: Check Set III.

\[ \begin{aligned} \mathrm{CCl_4} & amp;\rightarrow 0\ \text{lone pairs},\\ \mathrm{XeF_6} & amp;\rightarrow 1\ \text{lone pair},\\ \mathrm{IF_7} & amp;\rightarrow 0\ \text{lone pairs}. \end{aligned} \]

Since \[ \mathrm{XeF_6} \] has one lone pair, Set III is incorrect.

Hence,

\[ \boxed{\text{Only Sets I and II are correctly matched}.} \]

Therefore, the correct option is \[ \boxed{(A)}. \]