The product when an unsaturated hydrocarbon undergoes complete addition would be a saturated molecule. These saturated hydrocarbons becomes Alkanes where these molecules are only single-bonded in contrary to unsaturated hydrocarbons which have multiple bonds between atoms.

3. Conducts electricity in aqueous solution.
Because the ice melts and ice is cold....(this is a joke btw)
You use the equation q=mcdeltaT delta t=the chang in temp m=the mass of water and c=the specific heat capacity which for water is usually 4.18kJ
q is the amount of energy which you are trying to figure out
im sorry that i dont know the overall units for the equation but hope this helps you
:) :)