A d-aldohexose,Z,is subjected to a Ruff degradation.The degradation product is treated with nitric acid to yield an optically active aldaric acid.A possible structure for Z is: 
Definitions:
Normality Of Errors
An assumption in many statistical models that the errors in the predictions are normally distributed.
Independence Of Errors
Pertains to a condition in statistical analyses where the errors of a model’s predictions are not correlated with each other.
First-Order Autocorrelation
The correlation between sequential observations in a time series, specifically between each observation and its immediate predecessor.
Durbin-Watson Statistic
A measure used in statistics to detect the presence of autocorrelation in the residuals from a linear regression analysis.
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