Question

The BCl, is a planar molecule whereas NCI is

pyramidal because
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Answer 1

Answer:

Explanation: There is no lone pair on boron in BCl3 hence no repulsion takes place. There is a lone pair on nitrogen in NCl3 hence repulsion takes place. Therefore BCl3 is planar molecule but NCl3 is pyramidal molecule.

Explanation:

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Answer 2

Explanation:

There is no lone pair on boron in BCl3 hence no repulsion takes place. There is a lone pair on nitrogen in NCl3 hence repulsion takes place. Therefore BCl3 is planar

 have  hybridisation and no lone pair of electron on central atom but  have  hybridisation and also contains one lone pair of electron on nitrogen, so  is planar.