Paper: CSIR-NET December 2018 · Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Dipole Moment Polarity · Marks: 2 · Difficulty: Medium
Among $\mathrm{SiCl}_{4}, \mathrm{P}(\mathrm{O}) \mathrm{Cl}_{3}, \mathrm{NF}_{3}$, trans- $\left[\mathrm{SnCl}_{4}(\mathrm{py})_{2}\right]$ (py-pyridine), those with zero dipole moment are
(a)$\mathrm{SiCl}_{4}$, and $\mathrm{NF}_{3}$
(c)$\mathrm{SiCl}_{4}$, and trans- $\mathrm{SnCl}_{4}(\mathrm{py})_{2}$
(b)$\mathrm{SiCl}_{4}, \mathrm{P}(\mathrm{O}) \mathrm{Cl}_{3}$, and trans- $\mathrm{SnCl}_{4}(\mathrm{py})_{4}$
(d)$\mathrm{NF}_{3}$ and trans- $\mathrm{SnCl}_{4}(\mathrm{py})_{2}$
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed C; on checking, B is correct — see the explanation.
Printed C includes P(O)Cl3, which is polar.
Explanation
SiCl₄ (T_d) and trans-[SnCl₄(py)₂] (centrosymmetric) have no dipole; NF₃ and POCl₃ are polar.