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Q. The $ BCl_3$ is a planar molecule whereas $NCl_3$ is pyramidal because

AIPMTAIPMT 1995The p-Block Elements

Solution:

$BCl_3$ have $sp^ 2$ hybridisation and no lone pair of electron on central atom but $NCl_3$ have $sp^3$ hybridisation and also contains one lone pair of electron on nitrogen, so $BCl_3$ is planar.