How is heating of sugar and heating of ammonium chloride different from each other? Explain your answer.

When sugar is heated it melts and then caramelize giving of water. After this, it turns blank (carbon) and then coverts to co2 (carbon dioxide).

So, heating of sugar is an endothermic, decomposition and oxidation reaction.

When Ammonium Chloride is heated, it directly goes from solid state to vapour state without changing into liquid state.

So, heating of Ammonium Chloride is an example of sublimation reaction.