Q.

The question has two statements: statement I (S-I) and statement II (S-II) 

S-I: Glucose give a reddish-brown precipitate with Fehling’s solution because

S-II: Reaction of glucose with Fehling’s solution gives CuO and gluconic acid.

Mark the correct answer as 

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a

if both statement I and statement II are correct

b

if statement I is incorrect, but statement II is correct 

c

if statement I is correct, but statement II is incorrect 

d

if both statement I and statement II are incorrect 

answer is C.

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Detailed Solution

Explanation:

Statement I (S-I): Glucose gives a reddish-brown precipitate with Fehling’s solution because...

This statement is correct. Glucose, being a reducing sugar, reacts with Fehling's solution to produce a reddish-brown precipitate of copper(I) oxide (Cu2O).

Statement II (S-II): Reaction of glucose with Fehling’s solution gives CuO and gluconic acid.

This statement is incorrect. The reaction between glucose and Fehling's solution yields copper(I) oxide (Cu2O), not copper(II) oxide (CuO). The correct reaction is:

RCHO + 2 Cu2+ + 5 OH- → RCOO- + Cu2O + 3 H2O

Here, the aldehyde group of glucose (RCHO) is oxidized to a carboxylate anion (RCOO-), and the copper(II) ions (Cu2+) are reduced to copper(I) oxide (Cu2O), which precipitates as a reddish-brown solid.

Therefore, while Statement I is correct, Statement II contains inaccuracies regarding the reaction products.

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