4-Pyridinecarboxaldehyde(4PCA) is a slightly yellow oily liquid. Its relative density is 1.122, and its refractive index is 1.5352 (25°C). Flash point is 54 ° C. 4-Pyridinecarboxaldehyde is soluble in water and ether.4-Pyridinecarboxaldehyde, also commonly called pyridine-2-carboxaldehyde, is an organic compound with the formula NC5H4CHO. 4-Pyridinecarboxaldehyde is a colorless oily liquid with a distinctive odor. Older samples are often brown-colored owing to impurities.
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