Which of the following molecules are expected to exhibit intermolecular H-bonding? (I) Acetic acid (II) o-nitrophenol (III) m-nitrophenol (IV) o-boric acid Select correct alternate :

Question

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: Classify the hydrogen bonding type of each molecule. Acetic acid (I) dimerizes via intermolecular H-bonding. o-Nitrophenol (II) undergoes intramolecular H-bonding because the hydroxyl and nitro groups are situated very close to each other on adjacent carbons. Step 2: m-Nitrophenol (III) is unable to form intramolecular H-bonds due to the distance between groups and thus forms intermolecular H-bonds. o-Boric acid (IV) forms a hydrogen-bonded polymeric sheet structure. Step 3: Thus, molecules I, III, and IV exhibit intermolecular hydrogen bonding, which corresponds to option (c).

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