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Acetyl and acetaldehyde are two common organic compounds, with some significant differences in chemical structure and properties. We start with their chemical structure. The chemical formula of acetyl is C4H6O2, which is a ketone compound containing an acetyl group (- C=O) and a methyl group. 

The chemical formula of acetaldehyde is C2H4O, which is an aldehyde compound containing an acetaldehyde group (- CHO) and a hydrogen atom. It can be seen that acetyl and acetaldehyde have different molecular structures. Next, let's talk about their properties. 

Acetyl is a colorless liquid at room temperature, with a pungent odor, and can be dissolved in water and alcohol solvents. It also undergoes hydrolysis reactions under acidic conditions. Acetaldehyde is also a colorless liquid with a pungent odor. It is soluble in water and many organic solvents, and is prone to explosive reactions with oxygen or air. 

From a property perspective, acetyl is more stable, while acetaldehyde is more likely to react with oxygen. Let's explore their uses. Acetyl is mainly used in organic synthesis and the pharmaceutical industry, such as as as an organic synthesis reagent, hydrogen ion salt, and plant growth regulator. Acetaldehyde, on the other hand, is mainly used in the chemical industry as a solvent and chemical raw material. 

By comparing the chemical structures, properties, and uses of acetyl and acetaldehyde, we can gain a clearer understanding of their differences and characteristics. 

I hope this article can help readers better understand and apply these two compounds, and provide some assistance for the learning and research of chemical science.