A) Tollens reagent
B) Fehlings solution
C) 2, 4-dinitrophenylhydrazine
D) semicarbazide
Correct Answer: B
Solution :
: \[\underset{\begin{smallmatrix} Aliphatic \\ aldehyde \end{smallmatrix}}{\mathop{R-CHO}}\,+\underbrace{2C{{u}^{2+}}+5O{{H}^{-}}}_{Fehling\,solution}\xrightarrow{\Delta }\]\[\underset{\begin{smallmatrix} Cuprous\,oxide \\ \text{(Red}\,\text{ppt}\text{.)} \end{smallmatrix}}{\mathop{RCO{{O}^{-}}+C{{u}_{2}}O\downarrow +3{{H}_{2}}O}}\,\] Benzaldehyde does not respond to Fehlings solution due to alkaline nature of this reagent
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