Imagine that ice cubes are floating in a large bowl of punch. if there are enough cubes they will cover the surface of the punch and bump into on another. parts of the cubes will be below the surface of the punch and will displace the punch. will some cubes displace more cubes than others?

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.