Question

which one is a bad insulator of heat
a)water
b)zinc
c)alcohol
d)hydrogen ​

Answer 1

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Being a metal ,zinc is the best conductor of heat, water is an insulator of heat.

Hydrogen has the highest thermal conductivity of any gas.

The electrical conductivity of hydrogen varies according to temperature. If it is cold enough, it can be a superconductor. If it is hot enough, as a plasma, it is highly conductive.

The alcohol will absorb the heat, expand, or lose it and contract, at a quick enough pace. So, a bad conductor of heat.

Hence zinc is the only (good)conductor of heat from the above.