Which of the following is the chemical formula of hydro - carbon refrigerant R - 170? 

Concept:

where m = No. of Carbon atoms, n = No. of Hydrogen atoms, p = No. of Florine atoms, q = No. of Chlorine atoms

Given:

Representation and chemical formula of saturated hydrocarbons and unsaturated hydrocarbons are provided in the table. For hydrocarbon refrigerant R-170, we need to find the correct chemical formula.

Steps:

Analyze the given options:

1. C₂H₆

For Ethane:

• \(m = 2\) (number of carbon atoms)
• \(n = 6\) (number of hydrogen atoms)
• This satisfies the saturated hydrocarbon relationship:
• \(n + p + q = 2m + 2 = 6\)
• Correct

2. C₃H₃

For Propyl:

• \(m = 3\)
• \(n = 3\)
• This formula does not satisfy the saturated hydrocarbon relationship and is incorrect.

3. C₃H₆

For Propylene (R-1270):

• \(m = 3\)
• \(n = 6\)
• This is an unsaturated hydrocarbon and incorrect for R-170.

4. C₄H₁₀

For Butane:

• \(m = 4\)
• \(n = 10\)
• This is incorrect for R-170.

Conclusion:

The correct chemical formula for hydrocarbon refrigerant R-170 is:

1) C₂H₆