A) nitrogen atom is smaller than boron atoms
B) \[B-Cl\]bond is more polar than\[N-Cl\]bond.
C) \[N-Cl\]bond is more covalent than \[B-Cl\] bond
D) \[BC{{l}_{3}}\]has no lone pair but\[NC{{l}_{3}}\]has a lone pair of electrons
Correct Answer: D
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.
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