Which of the following compounds is identified as having no oxygen?

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The compound identified as having no oxygen is amine. Amines are organic compounds derived from ammonia by replacement of one or more hydrogen atoms by organic groups. Their general formula is R-NH2, R2NH, or R3N, where R represents an alkyl or aryl group. Since amines do not contain any oxygen atoms in their structure, they are classified as having no oxygen.

In contrast, esters contain an oxygen atom bonded to a carbon, forming the characteristic functional group of esters (RCOOR'). Nitrates include the nitrate ion (NO3−), which consists of nitrogen and oxygen atoms. Nitrosyl (NO) comprises nitrogen and oxygen as well. Therefore, the presence of oxygen in the chemical structures of esters, nitrates, and nitrosyl rules them out as compounds without oxygen.