Which is a characteristic of aromatic hydrocarbons?
A. They have triple bonds
B. They are cyclic
C. They are saturated
D. They are in straight lines.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.