A) propionaldehyde and acetone
B) propanol and propionic acid
C) propene and isobutene
D) isopropanol and propanol
Correct Answer: A
Solution :
Tollen's test is used to distinguish between propionaldehyde and acetone because Tollen's reagent is a weak oxidising agent and results in the formation of silver mirror with aldehydes. The test is only shown by aldehydes and not by ketones. \[\underset{\text{propionaldehyde}}{\mathop{C{{H}_{3}}CHO}}\,\,+2{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}\xrightarrow{3\,O{{H}^{-}}}\] \[C{{H}_{3}}-\underset{\text{acetone}}{\mathop{\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,}}\,-C{{H}_{3}}+\]Tollen?s reagent
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