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\( \mathrm{BF}_{3} \) and \( \mathrm{NF}_{3} \) both are covalent compounds but \( \mathrm{NF}_{3} \)
\( \mathrm{P} \) is polar whereas \( \mathrm{BF}_{3} \) is non-polar. This is because:

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(1) Nitrogen atom is smaller than boron atom
(2) \( \mathrm{N}-\mathrm{F} \) bond is more polar than \( \mathrm{B}-\mathrm{F} \) bond
(3) \( \mathrm{NF}_{3} \) is pyramidal whereas \( \mathrm{BF}_{3} \) is planar triangular
(4) \( \mathrm{BF}_{3} \) is electron deficient whereas \( \mathrm{NF}_{3} \) is not
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