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She is very small, giving her the ability to pose as a student during Mr. Benedict's tests of other prospective students.
Copper(I) oxide is also responsible for the pink color in a positive Benedict's Test.
Also we covered yesterday a Benedict's test of a non-reducing sugar... can't be coincidence."
Generally, Benedict's test will detect the presence of aldehydes, and alpha-hydroxy-ketones, including those that occur in certain ketoses.
The aldehyde functional group allows the sugar to act as a reducing agent, for example in the Tollens' test or Benedict's test.
Formation of copper(I) oxide is the basis of the Fehling's test and Benedict's test for reducing sugars.
She passed Mr. Benedict's tests several years ago, and at the end of the book is revealed to be Mr. Benedict's adopted daughter.
The principle of Benedict's test is that when reducing sugars are heated in the presence of an alkali, they get converted to powerful reducing compounds known as enediols.
Formic acid (HCOH) also gives a positive Fehling's test result, as it does with Tollens' test and Benedict's test also.