Which from following compounds has highest boiling point?

Step-by-step solution

Boiling points in organic compounds are governed by intermolecular force strength. Among homologous aldehyde series, increasing molecular weight and chain length enhance London dispersion interactions. Molecular weights are calculated as follows: acetaldehyde (C 2 H 4 O) MW = 44.06 g/mol, propionaldehyde (C 3 H 6 O) MW = 58.09 g/mol, butyraldehyde (C 4 H 8 O) MW = 72.12 g/mol, and valeraldehyde (C 5 H 10 O) MW = 86.15 g/mol. Valeraldehyde possesses the greatest molecular mass and longest carbon chain, resulting in