Which of the following compounds does not show only one signal in its 1H NMR spectrum? 
Definitions:
Population Variances
A measure of the dispersion or spread of a set of data points in a population; it quantifies how much the data points deviate from the mean of the population.
Confidence Interval
A range of values, derived from sample statistics, that is believed to contain the true population parameter with a certain level of confidence.
Hypotheses
Propositions or assertions made for the sake of argument that can be tested with scientific methods to be supported or refuted.
Normal Distributions
A type of continuous probability distribution for a real-valued random variable, where the data tend to cluster around a mean value.
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