Aromatic Aldehydes Ketones and Acids - Result Question 29
36. Explain, why $o$-hydroxy benzaldehyde is a liquid at room temperature while $p$-hydroxy benzaldehyde is a high melting solid?
$(1999,2 M)$
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Solution:
- Intramolecular $H-$ bonding in ortho hydroxy benzaldehyde is responsible for decrease in melting and boiling points.
$p-$ hydroxy benzaldehyde molecules are associated by intermolecular $H-$ bonding, has higher melting and boiling points.
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