Question

Why do alcohol and glucose not conduct electricity although they have hydrogen atom? ( please give an elaborated answer which I can write in the board exam)

Answer 1

alcohol and glucose are covalent molecules, Alcohol and glucose molecules are not ionized in water because the bonding within these molecules is strong enough to resist the breaking of their bonding by polar water. So, no charged ions in the water from ionized molecules, no conductivity.

The hydrogen atoms in the glucose and alcohol are covalently bonded which is a strong bond so it requires large amount of the energy for it to break and let lose the hydrogen so that the solution can conduct electricty.