Which of the following structures contains a secondary amine? 
Definitions:
Experiments
are systematic investigations conducted to test hypotheses, involving controlled variables to determine effects and outcomes.
Qualitative Research
A data-collection process that examines and interprets nonnumerical material.
Field Research
A method of collecting data through first-hand observation or interaction within a natural setting outside the laboratory or office.
Probability Sample
A probability sample is a sampling technique in which each member of the population has a known and equal chance of being selected, ensuring that the sample represents the larger population.
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