In an exothermic reaction, the energy stored in the chemical bonds of the reactants is: (A) less than the energy stored in the bonds of the products.
(B) equal to the total amount of energy released.
(C) equal to the energy stored in the bonds of the products.
(D) greater than the energy stored in the bonds of the products.
My teacher said that it was A because of the formula to calculate bond enthalpies. However, when I search up this problem, everyone says that D is right. Which one is it?

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.