Explain why the lightbulb lights up in the solution containing NaCl but not

in the solution containing sugar

Explanation:

Strong electrolytes are those solutions which undergo complete dissociation when dissolved in water.  The dissociation of strong electrolytes is given by a right arrow.

NaCl being an ionic compound dissociate in water to give sodium and chloride ions which help in conduction of electricity.

Whereas sugar being a covalent compound, do not dissociate into ions when dissolved in water and thus cannot conduct electricity.

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.