1.

Both BF_(3) and NF_(3) are covalent compounds. But BF_(3) is non - polar while NF_(3) is polar. This is because :

Answer»

atomic size of BORON is smaller than that of NITROGEN
Nitrogen is more electronegative than Boron.
BF bonds have less POLARITY than NF bonds.
`BF_(3)` is planar but `NF_(3)` is pyramidal in shape.

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