Nucleophilic attack 
 
 The nucleofugic departure 
 
 Nucleophilic attack of hydroxide ion on chloromethane 
 
 The acid-catalyzed reaction of the bromide ion on ethanol             
 
 Electrophilic attack 
 
 Addition of bromine to ethene       
 
 Addition of HCl to propene         
 
 The Markovnikov Rule           
 Substitution of the sulfonitrile mixture on the benzene 
 
 Acid-catalyzed esterification         
 
 Photochemical reaction of  bromine on methane 
 
 Polymerization of alkenes