Which compound will conduct electricity when it is dissolved in water?
Ionic substances conduct electricity when dissolved in water, the ions are free to carry charge. This includes CuSO4 which when dissolves it exists as SO4(2-) and Cu(2+) ions.
CH4 is fairly non-polar. This will be very hard to get to dissolve at all
C6H6 will also be hard to dissolve
C6H12O6 could possibly dissolve (not 100% sure, interactions could form with the O) but even if it did it would not conduct electricity.
C6H6 CH4 and C6H12O6 are covalent, they do not conduct electricity in any state. It is important you understand why in order to pass exams.
For the update, A metal hydroxide + acid —> Metal Salt + Water
The salt Al2(SO4)3 would be formed = X
H2O is Y
(remember to balance)