Which of the following aldehydes does not undergo an aldol addition when mixed with base? 
Definitions:
Competition
Competition is a situation where individuals or groups strive against each other to achieve a goal or receive a reward that is not universally obtainable.
Scapegoating
The practice of unfairly blaming an individual or group for problems or negative outcomes, often to deflect responsibility or criticism from oneself or one's group.
Differentiation
The process of distinguishing or creating variations among people or things, often to cater to different needs or objectives.
Moral Exclusion
The process by which individuals or groups are perceived as outside the boundary within which moral values, rules, and considerations of fairness apply.
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