Do cyclohexanes melt at 500°C?
All cyclohexanes melt at temperatures well below 500 °C.
Cyclohexane itself has only weak London dispersion forces, and it melts at 6.5 °C.
Even inositol (cyclohexane-1,2,3,4,5,6-hexol), with its strong hydrogen bonding, melts at 226 °C.
And the even more strongly hydrogen-bonded cyclohexane-1,2,3,4,5,6-hexacarboxylic acid melts with decomposition at 218 °C.
It is probably safe to say that all cyclohexanes will have melted or decomposed by the time the temperature reaches 500 °C.