`sp^3`d hybridisation result in

Options

A. A square planar molecule
B. An octahedral molecule
C. A trigonal bipyramid molecule
D. A tetrahedron molecule

Explanation

To determine the result of `sp^3d` hybridization, we can follow these steps:

### Step 1: Understand Hybridization
Hybridization is the mixing of atomic orbitals to form new hybrid orbitals that can accommodate bonding. The `sp^3d` hybridization involves one s orbital, three p orbitals, and one d orbital.

**Hint:** Remember that the number of hybrid orbitals formed equals the number of atomic orbitals mixed.

### Step 2: Identify the Type of Molecule
`sp^3d` hybridization typically occurs in molecules with the general formula AX5, where A is the central atom and X represents the surrounding atoms.

**Hint:** Look for the general formula that corresponds to the hybridization type.

### Step 3: Determine the Molecular Geometry
For AX5 type molecules, the geometry resulting from `sp^3d` hybridization is trigonal bipyramidal. In this arrangement, three atoms are positioned in a plane (equatorial) and two atoms are above and below this plane (axial).

**Hint:** Visualize the arrangement of atoms in the equatorial and axial positions to understand the geometry.

### Step 4: Confirm the Hybridization and Geometry
In the trigonal bipyramidal structure, the bond angles are 120° between the equatorial atoms and 90° between the axial and equatorial atoms. This confirms that `sp^3d` hybridization leads to a trigonal bipyramidal shape.

**Hint:** Use bond angles to distinguish between different molecular geometries.

### Conclusion
Thus, `sp^3d` hybridization results in a trigonal bipyramidal molecular structure.

**Final Answer:** The result of `sp^3d` hybridization is a trigonal bipyramidal molecule.