Which of the following hydrocarbons does not undergo Markovnikov’s addition of HBr?
Alkynes follow Markovnikov’s rule in the absence of peroxides, but propene follows anti-Markovnikov addition in the presence of peroxides. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.