a) HFC-134a
b) CFC-134a
c) HFC-1a
d) HC-13a
Answer: a
Explanation: Modern refrigerators use a refrigerant called HFC-134a. IUPAC name of HFC-134a is 1,1,1,2-Tetrafluoroethane. This is generally accepted because of its nature, it does not deplete the ozone layer.
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