Question

Which of the following test is given by both aldehyde as well as ketones?

• A. Tollen's reagent test
• B. $2,4DNP$ test
• C. Schiff's reagent test
• D. All of these

Answer 1

Answer: (B)

$2,4DNP$ test

Solution:- (B) $2,4$-DNP test

Aldehydes & ketones both contain the carbonyl group, i.e., $-\stackrel{|}{C}=O$, but in aldehydes the carbonyl group is attached to atleast one hydrogen atoms whereas in ketones it is linked to two alkyl or aryl groups. Due to this reason, aldehydes and ketones both gives $2,4$-DNP test but ketones could not pass Schiff's reagent test and Tollen's reagent test.

Hence $2,4$-DNP test is given both by aldehydes and ketones.