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Which of the following compounds exhibit intramolecular hydrogen bonding?

1. Salicylic acid
2. o-nitrophenol
3. Salicylaldehyde
4. All of these

Correct answer: All of these

Solution

Salicylic acid (2-hydroxybenzoic acid), o-nitrophenol, and salicylaldehyde (2-hydroxybenzaldehyde) all possess an -OH group ortho to a group with electronegative atoms, enabling intramolecular H-bond formation through a six-membered ring.

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