Using the melting point as a method of analysis for esters may not be the most suitable approach because esters are generally known for their volatility and tend to undergo decomposition before reaching their melting points.
Esters often have relatively low melting points, and their volatility can result in the loss of the sample before it reaches its melting point. The volatility of esters is attributed to their molecular structure, which typically includes a carbonyl group (C=O) and an oxygen atom in the ester linkage.
These functional groups contribute to the weak intermolecular forces (such as Van der Waals forces and dipole-dipole interactions) between ester molecules, making them more likely to evaporate or decompose at lower temperatures. For a more reliable analysis of esters, other techniques such as gas chromatography (GC) or infrared spectroscopy (IR) are commonly employed.