Hydrogen bonding plays a central role in which of the following phenomena?
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Hydrogen bonding plays a central role in which of the following phenomena?
✓ Correct answer: a) Ice floats in water
ExplanationA — Ice floats in water Ice has an open hexagonal structure due to extensive hydrogen bonding, making it less dense than liquid water. ✔ Hydrogen bonding involved B — Higher Lewis basicity of primary amines than tertiary amines in aqueous solution Primary amines form stronger hydrogen bonds with water, making them more solvated and thus effectively more basic in water. ✔ Hydrogen bonding involved C — Formic acid stronger than acetic acid | | JEE This is due to +I effect of –CH₃ reducing acidity in acetic acid, not due to hydrogen bonding. ❌ Not due to hydrogen bonding D — Dimerisation of acetic acid in benzene Acetic acid forms cyclic dimers via intermolecular hydrogen bonding in non- polar solvents like benzene. ✔ Hydrogen bonding involved Final Answer: A, B and D
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