@Basmitharts my options for lightest are I think :
Austin 1100
Triumph Spitfire 1500
Mazda MX-5 Gen 1

It is pretty close between the 1100 and the Spitfire, but the 1100 took the crown coming in around 1780 lbs about 15 lbs lighter than the Spitfire and 200 or so lighter than the Mazda.

Heaviest one is a easy, a launch edition Volvo XC40 Auto coming in at about 2200 kg so about 4850 lbs.

I have only counted cars I actually owned or driven for a decent while in my comparison.