Later in the course, we will compare the halogenation of differently substituted carbons, comparing reactions like the ones below. Which of the following statements is true about reactions I and II?

◦ Only reaction II has a positive heat of reaction (∆H
o)
◦ Only reaction I has a positive heat of reaction (∆H
o)
◦ Both reactions have a positive heat of reaction (∆H
o)
◦ Neither reaction has a positive heat of reaction (∆H
o)