Which of the following compounds does not show only one signal in its 1H NMR spectrum? 
Definitions:
Economic Model
A theoretical construct representing economic processes by a set of variables and a set of logical or quantitative relationships between them.
Trust
The firm belief in the reliability, truth, ability, or strength of someone or something.
User-Generated Classifications
Categories or groupings created by users rather than predefined by system designers, often allowing for more personalized and dynamic organization of content.
Folksonomies
Collaborative categorization systems using user-generated tags for items such as web pages, photographs, and articles, facilitating searching and discovery.
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