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Q.
The $ BCl_{3} $ is a planar molecule whereas $ NCl_{3} $ is pyramidal, because
AMUAMU 2005
Solution:
In boron trichloride, boron is $ sp^{2} $ hybridised and there is no lone pair on boron hence, $ BCl_{3} $ is planar in shape while in $ NCl_{3} $ the nitrogen is $ sp^{3} $ hybridised and there is a lone pair on nitrogen atom hence, the shape of $ NCl_{3} $ is pyramidal.
