Question

Explain the following on the basis of the valence bond theory. (Any 2)
i. BF3 planar but NH3 is not.
ii. CCl4 and SiCl4 are tetrahedral.

Answer 1

Answer:

BF

3

molecule is planar but NF

3

is pyramidal.

Reason

N atom is smaller than B.

Explanation:

Now CCl4 and SiCl4 both are the molecules in which the central atom has no lone pair. In this case, if number of electron pairs is 4, the geometry of the molecule is tetrahedral. (ii) BF3 is planar because, central atom has no lone pairs. ... If number of electron pairs is 2, its geometry is linear.

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Answer 2

Now CCl4 and SiCl4 both are the molecules in which the central atom has no lone pair. In this case, if number of electron pairs is 4, the geometry of the molecule is tetrahedral. (ii) BF3 is planar because, central atom has no lone pairs.