Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish copper(I) oxide. Schweizer's reagent and related complexes with ethylenediamine and other amines dissolve cellulose. Amino acids form very stable chelate complexes with copper(II). Many wet-chemical tests for copper ions exist, one involving potassium ferrocyanide, which gives a brown precipitate with copper(II) salts. COUNT 5
QSN1 What is the name of the componds that has more than one alcohol functional group? ANS1 Polyols QSN2 What are copper salts used to test? ANS2 reducing sugars QSN3 How is the presence of sugar shown by using Benedict's reagent and Fehling's solution? ANS3 color change QSN4 What color does the copper salts turn to using Benedict's reagent and Fehling's solution if sugar is present? ANS4 reddish QSN5 What does Schweizer's reagent dissolve? ANS5 cellulose