Shown below are the structures for two isomers of hydroxy-benzaldehyde. Structure (a) is 2-hydroxy-benzaldehyde and structure (b) is 4-hydroxy-benzaldehyde. The melting point for isomer (a), 2 °C, is significantly lower than the melting point of isomer (b), 118 °C.

Based on your knowledge of intermolecular forces, suggest a substantive reason for this difference in melting points.

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H Н. (a) OH Н. OH (b)