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Using old GA to contact you with some more spoilerish text.
Puzzle 3, Q5:
(C12H10N2O2)n should be the correct molecule, but that leads to https://en.wikipedia.org/wiki/2-Nitrodiphenylamine which has another molecule structure. So without something else to go on, I wouldn't know where to start to find what I'm looking for since that's the only information I have available.
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Don't forget that C14H10N2O2 formula for Q5 if not a full molecule - there are 2 free bonds because its a part of bigger structure. Also if you check 1,4-Diaminoanthraquinone(C14H10N2O2) it has diffrent layout and its a standalone molecule.
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"Don't forget" means I once knew it. ;P I don't even know what 2 fee (free?) bonds are meant to tell me. You have to understand, I remember next to nothing from chemistry in school that was more than half a lifetime ago, literally. I can study, if I know where to begin. That's how I got the help, understanding how to write the molecule structure down so I could research it. Then it was all about bruteforcing different answers.
For example, I have no clue why Q4 was vinyl, but one of the earlier wasn't. One of those led me to something vinyl as well.
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Yeah "free" :D
I'm also not chemist :D All puzzle was created depending on wiki and my basic school knowledge (I loved chemistry but it was ~12 years ago). People who know sth about chemistry don't have big problems with all tasks so I think I didn't make big mistakes in puzzle content XD But chemistry is not so easy branch of science :D I had similar "brute force" problems in other specialized branches of knowledge but I learned a lot from those puzzles. This is main purpose of this event :D
Guessing how to read the chemical formula is also easier (due to google) than figure out how to decipher messages in certain puzzles, so don't complain :D
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