Question

core - question # 22 which of the following refrigerants is an hfo? a r-1234yf b r-123 c r-134a d all three are hfos

Explanation:

HFOs (hydro - fluoro - olefins) are a class of refrigerants. R - 1234yf is an HFO. R - 123 is a hydrochlorofluorocarbon (HCFC) and R - 134a is a hydrofluorocarbon (HFC).

Answer:

A. R-1234yf