Which type of energy is always generated, at least in small amounts, when an energy transfer or transformation accounts? A. Potential energy B. thermal energy
C. Chemical energy
D. Radiant energy

there all right good

explanation:

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.