21. Aldehydes and Ketones: Nucleophilic Addition

Which of the following compounds is classified as an aldehyde?

Given the following structure: $C-H-C=O$, how should this compound be classified?

Which of the following best represents the generic structure of an aldehyde?

Given the following structural formula: ${\mathrm{CH}}_3\mathrm{CH}=O$ classify the compound as a ketone or an aldehyde.

Given the following structure: $CH$₃-CH₂-CHO, name the aldehyde displayed below.

Which of the following compounds is an aldehyde?