Correct Answer - Option 1 : halocarbon
Explanation:
Refrigerant:
A substance capable of absorbing heat from another required substance(space) can be used as a refrigerant. Air was used as a refrigerant in the olden days in many refrigeration systems because of most the safest and cheapest refrigerant.
(1) Halocarbon compounds:
Contains one or more halogens, chlorine, and bromine invented and developed by Charles Kettering in 1928. Sold in the market under the name of Freon, Genetron, Isotron, Areton.
For example, CFCl3 is called Freon-11, CF2Cl2 is called freon-12.
\(\mathop {\begin{array}{*{20}{c}} {\rm Cl}\\ |\\ {\rm Cl - C - Cl}\\ \begin{array}{l} \,\,|\\ \,\rm F \end{array} \end{array}}\limits_{\rm Feron - 11} \ \ \mathop {\begin{array}{*{20}{c}} {\rm F}\\ |\\ {\rm Cl - C - Cl}\\ \begin{array}{l} \,\,|\\ \,\rm F \end{array} \end{array}}\limits_{\rm Feron - 12} \)
Application: Domestic, commercial, and industrial purposes.
(2) Azeotropic mixtures:
Mixtures of refrigerants which behave as pure substance are known as an azeotropic mixture. For example, R-502.
(3) Inorganic refrigerants:
This is the refrigerant which consists of inorganic compounds like ammonia (NH3) and water (H2O).
(4) Hydrocarbon refrigerants:
Hydrocarbonare comprised of only hydrogen and carbon atoms. None of the hydrogen atoms have been replaced with chlorine or fluorine. Two common hydrocarbon refrigerants are methane and ethane.
\(\mathop {\begin{array}{*{20}{c}} {\rm H}\\ |\\ {\rm H - C - H}\\ \begin{array}{l} \,\,|\\ \,\rm H \end{array} \end{array}}\limits_{\rm Methane} \) \(\underset{\rm \ \ \ Ethane}{\begin{array}{*{20}{c}} {\rm H\, \ \,\,\, \ H}\\ {| \ \, \ \,\,\,\,\,\,|}\\ {\rm H - C - C - H}\\ \begin{array}{l} \,\,\,|\,\,\,\,\,\,\,\, \ |\\ \rm \ H\, \ \ \,\,\, {} H \end{array} \end{array}}\)
