Which of the following is the correct order of dipole moment?

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$H_{2} {O < NF}_{3} {< NH}_{3} {< BF}_{3}$

${BF}_{3} {< NH}_{3} {< NF}_{3} {< H}_{2} O$

${NH}_{3} {< BF}_{3} {< NF}_{3} {< H}_{2} O$

${BF}_{3} {< NF}_{3} {< NH}_{3} {< H}_{2} O$

answer is B.

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Detailed Solution

Dipole moment of H₂O is the highest because of high electronegativity of O and presence of two lone pairs. BF₃ has zero dipole moment because of symmetrical structure.

NH₃ has more dipole moment than NF₃ because F is highly electronegative atom.

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