Answer:
Carbon tetrachloride
Step-by-step explanation:
Electrolytes are ionic compounds. They dissociate in water to form ions. Here the ionic solids hence electrolytes are as follows:
Copper chloride
CuCl₂ → Cu²⁺ + Cl⁻
Sodium bromide
NaBr → Na⁺ + Br⁻
Magnesium sulfate
MgSO₄ → Mg²⁺ + SO₄²⁻
Carbon tetrachloride, CCl₄ is a covalent compound. It does not dissolve in water to form ions. Thus it is the only non-electrolyte.