One of your non-Chemistry teachers mentions a compound called ethylmethane. There is no such named compound. A structure that looks like it could be called ethylmethane would actually be called:

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

The answer for this question is d. none of these

Particle exchange energy though elastic collision , hope this .