The electrical conductance of an aqueous solution depends on the concentration of ions present in it.

1. Hydrochloric acid ($\text{HCl}$) is a strong acid and acts as a strong electrolyte, dissociating almost completely into $\text{H}^+$ and $\text{Cl}^-$ ions in an aqueous solution.
2. Acetic acid ($\text{C}_2\text{H}_4\text{O}_2$) is a weak acid and Ammonia ($\text{NH}_3$) is a weak base. Both are weak electrolytes and dissociate only partially, producing fewer ions.
3. Fructose ($\text{C}_6\text{H}_{12}\text{O}_6$) is a non-electrolyte and does not dissociate into ions in solution. Therefore, the aqueous solution of $\text{HCl}$ will have the maximum number of ions and will be the best conductor of electric current.