Why do ionic compounds not conduct electricity in the solid state?

Which one of the following properties is not generally exhibited by ionic compounds?

Reaction between $X$ and $Y$ forms compound $Z$. $X$ loses an electron and $Y$ gains an electron. Which of the following properties is not shown by $Z$?

An electrolytic cell consists of:
$(i)$ Positively charged cathode
$(ii)$ Negatively charged anode
$(iii)$ Positively charged anode
$(iv)$ Negatively charged cathode

Write the formula of the product formed when the element $A$ (atomic number $19$) combines with the element $B$ (atomic number $17$). Draw its electronic dot structure. What is the nature of the bond formed?

An electrolytic cell consists of
$(i)$ positively charged cathode
$(ii)$ negatively charged anode
$(iii)$ positively charged anode
$(iv)$ negatively charged cathode