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Explain why o-hydroxybenzaldehye is a liquid at room temperature while p-hydroxybenzaldehyde is a high melting solid. |
Answer» Solution :Due to INTRAMOLECULAR H-bonding (chelation), o-hydroxybenzaldehyde exists as discrete  molecules while due to inetermolecular H-bonding, p-hydroxybenzaldehyde exists as associated molecules. To BREAK these intermolecular H-bonds, a large AMOUNT of energy is needed. consequently, p-hydroxy-benzaldehyde has a much higher m.p. and b.p. than that of o-hydroxybezaldehyde. as a result, o-hydroxy-benzaldehyde is a liquid at room temperature while p-hydroxybanzaldehyde is a HIGH MELTING solid. |
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