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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb151

Which set contains only molecules with a non-zero dipole moment?

A $SF X_{4}$ , $PCl X_{3}$ , $ClF X_{3}$
B $PCl X_{3}$ , $BCl X_{3}$ , $ClF X_{3}$
C $ClF X_{3}$ , $XeF X_{2}$ , $SF X_{4}$
D $SF X_{4}$ , $XeF X_{4}$ , $BrF X_{5}$

Answer: A

SF X_{4}

(see-saw),

PCl X_{3}

(pyramidal) and

ClF X_{3}

(T-shaped) are all polar.

XeF X_{4}

(square planar),

BCl X_{3}

(trigonal planar) and

XeF X_{2}

(linear) have zero dipole, ruling out the other sets.

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