A) propionaldehyde and acetone
B) propanol and propionic acid
C) propene and isobutene
D) isopropanol and propanol
Correct Answer: A
Solution :
Tollens test is used to distinguish between propionaldehyde and acetone because Tollens 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. \[\underset{propionaldehyde}{\mathop{C{{H}_{3}}CHO}}\,~+\text{ }2{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}\xrightarrow[{}]{3O{{H}^{-}}}\] \[C{{H}_{3}}CO{{O}^{-}}+2Ag\downarrow +\text{ }4N{{H}_{3}}+2{{H}_{2}}O\] \[\underset{acetone}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} ||\,\,\,\, \\ O \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}}}\,+Tollens\text{ }reagent\] \[\xrightarrow{{}}\]No reaction
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