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Consider the following compounds: Hyperconjugation occurs in:

1. II only
2. III only
3. I and III
4. I only

Correct answer: I and III

Solution

Hyperconjugation occurs in compounds where there are alpha-hydrogens adjacent to a positively charged carbon or a double bond. Without the structures, I and III are most likely to exhibit hyperconjugation based on typical patterns.

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