Q.
The BCl3 is a planar molecule whereas NCl3 is pyramidal, because:
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ManipalManipal 2004Chemical Bonding and Molecular Structure
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Solution:
In boron trichloride, boron is sp2 hybridised and there is no lone pair on boron while in nitrogen. It is sp3 hybridised and there is a lone pair of electron in nitrogen. Hence, due to this reson BCl3 is a planer molecule and NCl3 is a pyramidal molecule.