The unholy trinity of organic chemistry exam nightmares. Just like those three students who always get blamed for trouble, hydrogen bonds, boiling points, and resonance are the usual suspects in every reasoning question. Professors have this uncanny ability to make these concepts appear in every single exam, as if they're getting kickbacks from the anxiety industry. You've memorized 50 reaction mechanisms, but somehow you're still drawing electron arrows at 2 AM, wondering why you didn't just major in interpretive dance.