Question

4. Glucose powder when heated with Fehling solution gives----
a. blue ppt
b. red ppt
c. green ppt.
d. black por​

Answer 1

Answer:

d number is the answer of this question

Answer 2

Solution:

correct option is (b) red ppt.

Explanation:

• Fehling's solution contains copper(II) ions complexed with tartrate ions in sodium hydroxide solution. Complexing the copper(II) ions with tartrate ions prevents precipitation of copper(II) hydroxide

• The reducing group of glucose (-CHO) is oxidized by the Cu++ ions in Fehling's to Cu+ (red copper oxide).

• Red solution is produced due to formation of cuprous oxide. $Cu_{2}O$ is produced instead of $CuO$.