What gases can cfc and hcfc refrigerants decompose into high temperatures open flames glowing metal services etc

The correct answer is chlorine gas.

Explanation:

When HCFC and CFC or chlorofluorocarbons get exposed to ultraviolet light for a longer duration, they gradually get dissociate into chlorine radicals, as shown below:  

CCl₃ ⇒ CCl₂F⁺ + Cl⁻

This Cl is not a molecule, however, is a radical, and thus, acts distinctly from Cl₂. The Cl⁻ reacts with O₃ (ozone) and reduces it to oxygen. Hence, depleting ozone present in the stratosphere, which safeguards life on Earth.  

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a