Which of the following best describes the experimental conditions under which an alkane can be chlorinated or brominated?
A) in the dark at room temperature
B) only at room temperature upon exposure to light
C) only in the dark at temperatures exceeding about 100°C
D) either at room temperature upon exposure to light or in the dark at temperatures exceeding about 100°C

Question

Quizplus · Accepted Answer

Alkanes can be chlorinated or brominated either in the dark at temperatures exceeding about 100°C or at room temperature upon exposure to light. In the presence of light, the halogen molecule (chlorine or bromine) dissociates into highly reactive atoms that can then react with the alkane molecule. At higher temperatures, the activation energy required for the reaction is lower and therefore the reaction can occur in the absence of light.

Which of the Following Best Describes the Experimental Conditions Under