Question:
Which of the following molecules consist minimum lone pair of electrons in the valence shell of central atom?
Which of the following molecules consist minimum lone pair of electrons in the valence shell of central atom?
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Count the lone pairs on the central atom of each molecule from its valence electrons and bonds.
Updated On: Nov 13, 2026
- \(\mathrm{SCl}_{2}\)
- \(\mathrm{PCl}_{3}\)
- \(\mathrm{ClF}_{3}\)
- \(\mathrm{XeF}_{4}\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Lone pairs on the central atom = (valence electrons - bonds used)/2.
Step 2: Count
\(\text{SCl}_2\): S has 2 lone pairs. \(\text{PCl}_3\): P has 1 lone pair.
Step 3: More counts
\(\text{ClF}_3\): Cl has 2 lone pairs. \(\text{XeF}_4\): Xe has 2 lone pairs.
Step 4: Result
The minimum is 1 lone pair, in \(\text{PCl}_3\).
Final Answer:
\(\text{PCl}_3\) has the fewest lone pairs on its central atom. \[ \boxed{\text{(B) }\mathrm{PCl}_{3}} \]
Lone pairs on the central atom = (valence electrons - bonds used)/2.
Step 2: Count
\(\text{SCl}_2\): S has 2 lone pairs. \(\text{PCl}_3\): P has 1 lone pair.
Step 3: More counts
\(\text{ClF}_3\): Cl has 2 lone pairs. \(\text{XeF}_4\): Xe has 2 lone pairs.
Step 4: Result
The minimum is 1 lone pair, in \(\text{PCl}_3\).
Final Answer:
\(\text{PCl}_3\) has the fewest lone pairs on its central atom. \[ \boxed{\text{(B) }\mathrm{PCl}_{3}} \]
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