Question

Observe the following reaction and same reaction is carried out with the following compound: 

X and Y can be differentiated by: 
 

• A. Fehling’s test
• B. 2,4-DNP
• C. NaHSO$_3$
• D. Lucas test

Hint:

Fehling’s test is specific for aliphatic aldehydes and does not react with ketones.

Answer 1

The Correct Option is A

Step 1: Identify the type of reaction.
The reaction shown is acid-catalysed cleavage of vinyl ether, which produces an aldehyde and a ketone.
Step 2: Identify products X and Y.
On hydrolysis:
\[ \text{Allyl vinyl ether} \xrightarrow{H_2O/H^+} CH_3CHO + CH_3COCH_3 \]
Here,
\[ X = CH_3CHO \ (\text{aldehyde}) \] \[ Y = CH_3COCH_3 \ (\text{ketone}) \]
Step 3: Select appropriate test for differentiation.
Fehling’s test is positive for aldehydes and negative for ketones.
Thus:
\[ X \rightarrow \text{Positive Fehling’s test} \] \[ Y \rightarrow \text{Negative Fehling’s test} \]
Step 4: Conclusion.
Hence, Fehling’s test can differentiate X and Y.