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`BCl_3` molecule is planar while `NCl_3` is pyramidal because
A. B-Cl bond is more polar than N-Cl bond
B. N-Cl bond is more covalent than B-Cl bond
C. nitrogen atom is smaller than boron atom
D. `BCl_3` has no lone pair but `NCl_3` has a lone pair of electrons

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Correct Answer - D
`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.

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