Question

Which one of the following is a CFC refrigerant ?

• A. $R-744$
• B. $R-290$
• C. $R-502$
• D. $R-718$

Answer 1

The correct option is C $R-502$

There are 3 cases for the designation of the refrigerant:

Case (i) :Saturated Hydrocarbon refrigerant.

Case (ii): Unsaturated Hydrocarbon refrigerant.

Case (iii): Inorganic refrigerant.

$\therefore$ For Inorganic refrigerant:

R-700 + Molecular weight

i.e $R-744\Rightarrow R-700+44=C{O}_2$

$R-718\Rightarrow R-700+18=H_{2}O$

For Hydrocarbon refrigerant:

$R-290=C_3{H}_8$

$R-502=CHCl{F}_2+CCI{F}_{2}C{F}_3$

So only $R-502$ is a CFC refrigerant.