Question

# o-Hydroxybenzaldehyde is a liquid at room temperature while p-hydroxybenzaldehyde is a high melting solid because of:

A
Hbonding
B
ionisation energy
C
electron gain enthalpy
D
lattice enthalpy.

Solution

## The correct option is D $$H-$$bondingComparision between intramolecular hydrogen bond and intermolecular hydrogen bond=Intramolecular forces are the forces that hold atoms together within a molecule. Intermolecular forces are forces that exist between molecules.intermolecular: when the attraction is between two distinct molecules of same or different compounds. For example, between two molecules of $$H_2O$$ or between a molecule of $$H_2O$$ and a molecule of $$NH_3$$.Intramolecular: when such attraction is among two parts of a molecule. For example, $$H$$ of the hydroxyl group is attracted by $$O$$ of the nitro group in o-nitrophenol.Intermolecular H-bonding increases intermolecular attraction hence increases boiling point, viscosity and surface tension.Whereas, intramolecular H-bonding tends to decrease the surface area of the molecule hence decreases boiling point and surface tension.So the correct option is [A].Chemistry

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