An example of ${\mathrm{sp}}^2$ hybridization is

‘Sn’ belongs to 14th group so it has 4 electron in its outer most shell.

SnCl₂ has, two Sn-Cl bonds and one lone pair at ‘Sn’. So, according to VSEPR theory, it has trigonal planar structure.

Hence In SnCl₂ , ‘Sn’ has sp² hybridization.