CUET · CHEMISTRY · PYQ PAPER 2023
Read the Passage below and answer the question:
Aldehydes and Ketones, having atleast one methyl group linked to the carbonyl carbon atom (methyl Ketones), are oxidised by sodium hypohalite to sodium salts of corresponding carboxylic acids having one carbon atom less than that of carbonyl compound is converted to haloform. This oxidation does not affect a carbon - carbon double bond, if present in a molecule.
Which of the following statements are true?
A. \(CH_3CHO\) and \(CH_3CH_2CHO\) can be distinguished by Tollen's test.
B. \(CH_3CH_2CHO\) and \(CH_3COCH_3\) can be distinguished by Fehling's test.
C. \(CH_3CHO\) and \(C_6H_5CHO\) can be distinguished by Fehling's test.
D. \(HCHO, CH_3CHO\) can be distinguished by \(NaHCO_3\) test.
E. \(HCOOH, CH_3COOH\) can be distinguished by \(NaHCO_3\) test.
Choose the correct answer from the options given below :
- A (A), (B) only
- B (B), (C) only
- C (C), (D) only
- D (E), (A) only
Answer & Solution
Correct Answer
(B) (B), (C) only
Step-by-step Solution
Detailed explanation
Statement B: True. \(CH_3CH_2CHO\) (aldehyde) gives positive Fehling's test; \(CH_3COCH_3\) (ketone) does not. Statement C: True. \(CH_3CHO\) (aliphatic aldehyde) gives positive Fehling's test; \(C_6H_5CHO\) (aromatic aldehyde) does not.
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