Single Choice

When acetaldehyde is heated with Fehling's solution, it gives a precipitate of:

ACu
BCuO
C$$Cu + Cu_2O + CuO$$
D$$Cu_2O$$
Correct Answer

Solution

Fehlings solution is a tartaric acid complex of cupric ions.
When acetaldehyde is heated with Fehling's solution, it gives a red precipitate of $$\displaystyle Cu_2O$$
$$\displaystyle CH_3CHO +2Cu^{2+} + 5OH^- \xrightarrow {\Delta} CH_3COO^- + Cu_2O \downarrow + 3H_2O $$
Acetaldehyde is oxidized to acetate ion and cupric ions are reduced to cuprous oxide.

SIMILAR QUESTIONS

Physical World

When acetaldehyde is heated with Fehling's solution, it gives a precipitate of:

Physical World

Few simple chemical tests are given below to differentiate between the pairs of compounds. Which of the following tests is not correct for differentiation?

Physical World

What is the test to differentiate between pentan-2-one and pentan-3-one?

Physical World

The compound which reacts with Fehling's solution is:

Physical World

Fill in the blanks. Fehling solution A consists of an aqueous solution of copper sulphate. While Fehling solution B consists of an alkaline solution of ..........

Physical World

A substance $$C_5H_{10}$$ does not reduce Fehling's solution, forms a phenylhydrazone, shows the haloform reaction, and can be converted into n-pentane by strong reduction. The structural formula of the original substance is:

Physical World

Which of the following will not reduce Fehling's solution?

Physical World

An organic compound $$'A'$$ with molecular formula $$C_8H_8O_2$$ gives positive $$DNP$$ and iodoform test. It does not reduce Tollens or Fehling's reagent and does not decolourised bromine water also. On oxidation with chromic acid $$(H_2CrO_4)$$, it gives a carboxylic acid $$(B)$$ with molecular formula $$C_7H_6O_2$$. Deduce the structures of $$A$$ and $$B$$.

Physical World

Name the aldehyde which does not give Fehling's solution test.

Physical World

Which of the following compounds will reduce Fehling's solution?

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