JEE Advanced 2019 · Paper 1 · Chemistry Q9

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ChemistryMultiple correct+4 / -1Question 27 of 54

Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules possess permanent dipole moment at room temperature.

\ce{BeCl2}

\ce{CO2}

\ce{BCl3}

\ce{CHCl3}

\ce{NO2}

\ce{NH3}

\ce{POCl3}

\ce{CH3Cl}

\ce{BF3}

\ce{O3}

\ce{SF6}

\ce{XeF6}

\ce{SO2}

\ce{C6H5Cl}

\ce{H2Se}

\ce{BrF5}

Answer and worked solution

Official answer: B, D

(A) $\ce{BeCl2}$ and $\ce{CO2}$ are linear and $\ce{BCl3}$ is trigonal planar, so they are non-polar. Not all four are polar.
(B) $\ce{NO2}$ (bent), $\ce{NH3}$ (pyramidal), $\ce{POCl3}$ (distorted tetrahedral) and $\ce{CH3Cl}$ are all polar. ✓
(C) $\ce{BF3}$ and $\ce{SF6}$ are non-polar.
(D) $\ce{SO2}$ (bent), $\ce{C6H5Cl}$ , $\ce{H2Se}$ (bent) and $\ce{BrF5}$ (square pyramidal) are all polar. ✓

(B), (D)

Topics:Bond parameters and dipole moment VSEPR theory

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JEE Advanced 2019 · Paper 1, Chemistry question 9