NH_3 has a net dipole moment, but boron trifluoride (BF_3) has zero dipole moment, because

JEE Main Chemistry question

has a net dipole moment, but boron trifluoride () has zero dipole moment, because

(A)B is less electronegative than N
(B)F is more electronegative than H
(C) is pyramidal while is planar
(D) is pyramidal while is trigonal planarCorrect

Answer: (D)

Solution

is trigonal planar with the three B–F bond dipoles arranged symmetrically at 120° to each other, so their vector sum cancels exactly to zero net dipole moment. , however, is pyramidal (due to the lone pair

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Question ID VK-133360