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Aldehydes and cyclic ketones are two common functional groups in organic compounds, which have significant differences in chemical properties and structures. 

The difference between aldehydes and cyclic ketones is mainly reflected in their structure and chemical properties. Structurally, aldehydes are functional groups of a class of compounds, with the general formula RCHO, where R represents an alkyl or aryl group; Cycloketones are functional groups of another type of compound, with the general formula RCOR ', where R and R' represent alkyl or aryl groups, respectively. 

From the formula, it can be observed that the molecular structures of aldehydes and cyclic ketones are different. In addition, from the perspective of chemical properties, aldehydes and cyclic ketones also have significant differences. Aldehydes can react with sodium hydroxide in aqueous solution to generate corresponding alcohols and aluminum hydroxide, while cyclic ketones do not possess this property. 

In addition, aldehydes can generate corresponding amino alcohols in ammonia solution, while cyclic ketones do not possess this property. It can be seen that aldehydes and cyclic ketones also have different chemical properties. 

There are two main methods for identifying aldehydes and cyclic ketones: chemical reagent method and instrumental analysis method. The chemical reagent method uses specific reagents to react with a sample and determine whether it is an aldehyde or a cyclic ketone based on the results of the reaction. 

For example, when using silver hydroxide reagent for detection, if organic silver salts are produced, it indicates that they are aldehydes; If organic ketone salts are produced, it indicates that they are cyclic ketones. 

The instrumental analysis method is to use some instruments and equipment for analysis, such as infrared spectroscopy, nuclear magnetic resonance, etc. 

Through these methods, aldehydes and cyclic ketones can be accurately identified. In summary, aldehydes and cyclic ketones are two common functional groups in organic compounds, and they have significant differences in structure and chemical properties. 

By using appropriate identification methods, we can accurately distinguish between the two compounds, which helps to better understand and apply them.