Question
Chemistry Question on Aldehydes, Ketones and Carboxylic Acids
Which of the following pairs of organic compounds give positive Tollens? test?
A
Formic acid, acetone
B
Formic acid, ethanal
C
Ethanal, acetone
D
Formic acid, acetic acid
Answer
Formic acid, ethanal
Explanation
Solution
Both aliphatic and aromatic aldehyde reduce Tollens? reagent. The only carboxylic acid i.e., Formic acid reduces Tollens? reagent as it contains both aldehyde (−CHO) as well as carboxyl group (−COOH)