[tmeehan25]

I just started organic chemistry and I was wondering if anybody had any shortcuts when it comes to finding out how many resonance structures or hydrogens are in a molecule? I can figure it out after a decent amount of time but my professor expects us to figure it out in a matter of seconds. Anybody have tips on how to tell which atoms have resonance quickly?

[discodermolide]

What is your concept of resonance? And how exactly does this relate to the number of hydrogens?
I'm asking because I don't really understand what you are asking.

[tmeehan25]

sorry I was in a hurry when typing this. Looking back I did ask this in a weird way. I'm asking how some people can look at a molecule and quickly decide which atoms can participate in resonance and which atoms cannot. The other question I asked was how to quickly add up all the hydrogens in a ring but I just figured that out a second ago.

[discodermolide]

Thanks.
Which sort of atoms do you think may be able to take part in resonance?