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Question

The oxidising species in Benedict solution is

A
Ag+
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B
Li+
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C
Cu+2
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D
Ba+2
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Solution

The correct option is C Cu+2
Benedict's solution is used to test for aldehyde group. The aldehyde group oxidised and in the process, reduces the Cu2+ found in the complex provide by Benedict solution to form copper (I) oxide, Cu2O.
RCHO+Cu(citrate)22+5OHRCOO + Cu2O + 3H2OAldehyde Fehling's solution Carboxylate ion Brick Red ppt
Thus the correct option is (c).

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