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Correct order of dipole moment of the given molecules is

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BF₃ > NF₃ > NH₃

${NF}_{3} > {NH}_{3} > {BF}_{3}$

${NH}_{3} > {NF}_{3} > {BF}_{3}$

${NH}_{3} > {BF}_{3} > {NF}_{3}$

answer is B.

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Detailed Solution

Among NH₃ and NF₃ molecules NH₃ has more dipole moment because bond dipoles acting in the same direction in NH₃ whereas in NF₃ bond moments cancel to some extent as they act in opposite direction.

BF₃ is symmetric molecule and it's dipole moment is zero

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