Answer:
The correct answer is option 3.
Explanation:
Condensation of ethanol vapors is an exothermic process. This is because particles in gaseous has highest energy . Some of this energy gets released when these particles or ethanol vapors condenses into a liquid state where they have less amount of energy in comparison to gaseous state.
[tex]C_2H_5OH(g)\rightarrow C_2H_5OH(l) + Heat[/tex]
As we know that exothermic reaction are those reaction in which heat is released into the surroundings.
Where as the other options are example of an endothermic reaction.where heat is absorbed from the surroundings.
Hence, the correct answer is option 3.