**Explanation:**

The shape of a molecule is determined by its electron geometry and the number of bonding and non-bonding electron pairs around the central atom.

In the case of SFCl, we have to determine the shape of the molecule based on the Lewis structure and the VSEPR theory.

**Lewis Structure:**

To determine the Lewis structure, we need to know the number of valence electrons for each atom in the molecule. Sulfur (S) has 6 valence electrons, fluorine (F) has 7 valence electrons, and chlorine (Cl) has 7 valence electrons.

The Lewis structure for SFCl can be written as follows:

S: 6 valence electrons
F: 7 valence electrons x 1 = 7 valence electrons
Cl: 7 valence electrons x 1 = 7 valence electrons

Total: 20 valence electrons

The Sulfur atom will be the central atom as it is less electronegative than fluorine and chlorine. The chlorine and fluorine atoms will be bonded to the sulfur atom.

**Electron Geometry:**

To determine the electron geometry, we need to count the number of electron groups (bonding and non-bonding) around the central atom.

In the case of SFCl, there are two electron groups around the central sulfur atom:

1. Bonding pair (S-F)
2. Bonding pair (S-Cl)

Therefore, the electron geometry is linear.

**Molecular Geometry:**

To determine the molecular geometry, we need to consider only the bonding electron pairs around the central atom.

In the case of SFCl, there are two bonding pairs around the central sulfur atom. Since there are only two bonding pairs, the molecular geometry is also linear.

**Conclusion:**

The shape of the molecule SFCl is linear. Therefore, option C - Octahedral is incorrect.

SF3cl3 has hybridization sp3d2 with no lone pair hence its structure is octahedral