Which of the following carbon-hydrogen bonds exhibits the lowest wavenumber for a C-H stretch in infrared spectroscopy? 
Definitions:
Exposure Levels
The degrees or amount of exposure to a particular substance, condition, or agent that an organism or ecological system experiences.
Toxins
Harmful substances produced by living organisms, including plants, animals, fungi, and bacteria, that can cause disease or damage when absorbed or ingested by others.
Uncertainty
The state of having limited knowledge where it is impossible to exactly describe the existing state, a future outcome, or more than one possible outcome.
Cultural Hazard
Risks to health or safety arising from the cultural practices, beliefs, or societal norms of a group.
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