SATHEE: Chemical Bonding and Molecular Structure

Chemical Bonding and Molecular Structure - Result Question 75

####77. The $B C l_{3}$ is a planar molecule whereas $N C l_{3}$ is pyramidal because

[1995]

(a) $B - C l$ bond is more polar than $N - C l$ bond

(b) $N - C l$ bond is more covalent than $B - C l$ bond

(d) $B C l_{3}$ has no lone pair but $N C l_{3}$ has a lone pair of electrons

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Solution:

(d) As there is no lone pair on boron in $B C l_{3}$ therefore no repulsion takes place. But there is a lone pair on nitrogen in $N C l_{3}$ . Therefore repulsion takes place. Thus, $B C l_{3}$ is planar molecule but $N C l_{3}$ is a pyramidal molecule.

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Chemical Bonding and Molecular Structure - Result Question 75

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