BCl3 is a planar molecule whereas NCl3 is pyramidal because:
A
Nitrogen atom is smaller than boron atom
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B
BCl3 has no lone pair but NCl3 has a lone pair of electrons
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C
B−Cl bond is more polar than N−Cl bond
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D
N−Cl bond is more covalent than B−Cl bond
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Solution
The correct option is BBCl3 has no lone pair but NCl3 has a lone pair of electrons BCl3 has steric number =12(3+3)=3
So it is sp2 hybridized and have three bond pairs and zero lone pairs, thus shape being trigonal planar.
Similarly, NCl3 has steric number =12(5+3)=4
So it is sp3 hybridized. It has three bond pairs and one lone pair resulting in tetrahedral geometry and trigonal pyramidal shape.