JEE Main Chemistry question

Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that has no dipole moment but has?

(A) is spherically symmetrical, is not
(B)The molecule must be linear
(C)The atomic radius of P is larger than the atomic radius of B
(D)The molecule must be planar triangularCorrect

Answer: (D)

Solution

has no net dipole moment only if its three identical bond dipoles cancel by symmetry, which happens precisely in a trigonal planar (120° bond angle) arrangement; , being

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Question ID VK-138585