Which molecular geometry is least likely to occur with sp3 hybridization?
tetrahedral
trigonal planar
bent
trigonal pyramidal

Answer : The molecular geometry least likely to occur with hybridization is, trigonal planar.

Explanation :

In trigonal pyramidal:

Bond pair = 3

Lone pair = 0

The number of electron density around the central atom is 3.

That means these molecule have central atoms with 0 lone pair and 3 atoms bonded to them.  Thus, the molecular geometry will be, trigonal planar. For example :

There are three possibility of molecule to be hybridized which are tetrahedral, bent and trigonal pyramidal.

In tetrahedral:

Bond pair = 4

Lone pair = 0

The number of electron density around the central atom is 4.

That means these molecule have central atoms with zero (0) lone pair and four (4) atoms bonded to them.  Thus, the molecular geometry will be, tetrahedral. For example :

In bent:

Bond pair = 2

Lone pair = 2

The number of electron density around the central atom is 4.

That means these molecule have central atoms with 2 lone pair and 2 atoms bonded to them.  Thus, the electronic geometry is tetrahedral and molecular geometry will be, bent. For example :

In trigonal pyramidal:

Bond pair = 3

Lone pair = 1

The number of electron density around the central atom is 4.

That means these molecule have central atoms with 1 lone pair and 3 atoms bonded to them.  Thus, the electronic geometry is tetrahedral and molecular geometry will be, trigonal pyramidal. For example :

Hence, the molecular geometry least likely to occur with hybridization is, trigonal planar.

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