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  4. The BCl3 is a planar molecule whereas NCl3 is pyramidal, because:

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Q. The $ BC{{l}_{3}} $ is a planar molecule whereas $ NC{{l}_{3}} $ is pyramidal, because:

ManipalManipal 2004Chemical Bonding and Molecular Structure

Solution:

In boron trichloride, boron is $ s{{p}^{2}} $ hybridised and there is no lone pair on boron while in nitrogen. It is $ s{{p}^{3}} $ hybridised and there is a lone pair of electron in nitrogen. Hence, due to this reson $ BC{{l}_{3}} $ is a planer molecule and $ NC{{l}_{3}} $ is a pyramidal molecule.