A defining feature of a material that is a good insulator would be its ability to stop or cancel an electric charge of another material. This happens because the molecules in the material are stable and there are no free electrons that would allow the charges to flow.
The periodic table increases as you read left to right so it is A.
Here is your answer
Since, carbon atoms are triple bonded.
So functional group present in the compound is ALKYNE
HOPE IT IS USEFUL
Heat & pressure. hope this helps
My answer to the question is "Gas particles are acting like tiny,solid spheres".
