Q. Explain, why o-hydroxybenzaldehyde is a liquid at room
temperature while p-hydroxybenzaldehyde is a high melting
solid?

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Solution:

Intramolecular H-bonding in ort/io-hydroxybenzaldehyde
decreases its melting point as well as boiling point.
Molecules of p-hydroxybenzaldehyde is symmetrical,
associated together by intermolecular H-bonds, has higher
boiling point and melting point.

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