Ans: The most recent form of refrigerants are HCs or Hydrocarbon refrigerants. They are completely Chlorine free and have the least potential for ozone depletion and global warming.  Some examples of HC refrigerants are, R-290, R-600A and more. They are already being used as refrigerants by many brands in India. However, they have one major disadvantage i.e. they are highly inflammable and can catch fire very easily which makes them quite dangerous especially in case of AC malfunctions such as refrigerant leakage etc.