Question
What three big ideas let you reason through most Content Category 4D passages?
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Answer
Wave equations, sign conventions, and characteristic absorption energies.
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Question
What does downfield mean in 1H NMR, and what commonly causes it?
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Answer
Deshielded; often near electronegative atoms or π systems.
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Question
What 1H NMR pattern is the classic clue for an ethyl group?
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Answer
A triplet plus a quartet.
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Question
Equivalent protons vs adjacent-carbon neighbors in the n+1 rule: what is the key distinction?
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Answer
Equivalent protons do not split each other; only adjacent-carbon non-equivalent protons count.
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