Identify the leaving group in the following reaction. 
Definitions:
Sampling Error
The error caused by observing a sample instead of the whole population, leading to a difference between the sample statistic and the population parameter.
Population Parameters
Quantitative characteristics of a population, such as mean or standard deviation, derived from measurements of the individuals within the population.
NonSampling Error
Errors that occur during data collection or processing but are not related to the act of selecting a sample from the population.
Cluster Sampling
A sampling technique where the population is divided into clusters, and a sample of these clusters is randomly selected for study.
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