Chemical Bonding and Molecular Structure - Result Question 75
####77. The $BCl_3$ is a planar molecule whereas $NCl_3$ is pyramidal because
[1995]
(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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Solution:
- (d) As there is no lone pair on boron in $BCl_3$ therefore no repulsion takes place. But there is a lone pair on nitrogen in $NCl_3$. Therefore repulsion takes place. Thus, $BCl_3$ is planar molecule but $NCl_3$ is a pyramidal molecule.
