Which of the following molecules are achiral? 
Definitions:
Associative Learning
The process of learning in which a connection is made between two stimuli or a stimulus and a behavior, fundamental in behavioral psychology.
Stimuli
External factors or changes in the environment that influence the behavior or responses of individuals.
Operant Conditioning
A learning process through which the strength of a behavior is modified by reinforcement or punishment.
Behaviors Increase
A rise in the frequency or intensity of actions or mannerisms.
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