Chemistry · Covalent Bonding: Concept of electronegativity, Fajan's rule, dipole moment, Valence Shell Electron Pair Repulsion (VSEPR) theory and shapes of simple molecules
Which set of molecules is polar?
Which set of molecules is polar?
- A. \( \operatorname{XeF}_{4}, I F_{7}, S O_{3} \)
- B. \( P C l_{5}, C_{6} H_{6} \)
- C. \( \operatorname{sn} C l_{2}, s O_{2}, N O_{2} \)
- D. \( C O_{2}, C S_{2}, C_{2} H_{6} \)
Step-by-step solution
Polarity depends on molecular geometry and bond polarity. SnCl2 has a bent shape (lone pair on Sn) giving net dipole. SO2 is bent with polar S-O bonds, net dipole. NO2 is bent and polar. All three are polar. Other options contain symmetric, nonpolar molecules: XeF4 (square planar), IF7 (pentagonal bipyramidal), SO3 (trigonal planar), PCl5 (trigonal bipyramidal), C6H6 (planar hexagonal), CO2 (linear), CS2 (linear), C2H6 (nonpolar). Hence only option C is correct.
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