please help need asap. will upvote

1. What are two important factors that govern the study of Chemical Reactions? (2 points) 2. Draw mechanism and energy profile diagram when chlorine reacts with methane (4 points). 3. Draw a mechanism and energy profile diagram when propane reacts with Bromine. Indicate minor and major products. Which product is more stable and why? What is Hammond's postulare? ( 6 poins) 4. Arrange the following 4 carbocations in the order of increasing stability. Give two reasons and explain for their stability ( 3 points) CH3CH2CH3(CH3),CH3CH2CH2CH2CH3CH2C2CH3)2,+C3