SCl4
S has a valency of 6 but bond with 4 Cl
S valency remains 2
2 valence electrons=1 lone pair
1 lone pair + 4 bonds with chlorine
Making 5CN
That's Sp³d
BrF3
Bromine has a valency of 7 but bond with 3 fluorine
Bromine valence electrons remains 4
4 valence electrons equals 2 lone pairs
2 lone pairs plus 3 bonds
That's CN of 5
That's Sp³d