A) oxidation with acidic \[{{K}_{2}}C{{r}_{2}}O\] followed by reaction with Fehling solution
B) oxidation with \[KMn{{O}_{4}}\] followed by reaction with Fehling solution
C) oxidation with cone. \[{{H}_{2}}S{{O}_{4}}\] followed by reaction with Fehling solution
D) oxidation by heating with copper followed by reaction with Fehling solution
Correct Answer: D
Solution :
[d]| Fehling solution is a weak oxidising agent which can oxidise aliphatic aldehyde but not ketone. A primary alcohol undergoes oxidation with alkaline \[KMn{{O}_{4}},\] acidic dichromate and conc. \[{{H}_{2}}S{{O}_{4}}\] to give acids with Cu they give aldehydes. |
| \[\underset{1-propanal}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH}}\,\xrightarrow[Heat]{Cu}\underset{(\Pr opanal\,\,responds\,\,positive\,\,to\,\,Fehling\,\,sol.)}{\mathop{C{{H}_{3}}C{{H}_{2}}CHO}}\,\] |
| \[\underset{2-propanal}{\mathop{C{{H}_{3}}CHOHC{{H}_{3}}}}\,\to \underset{(Negative\,\,Fehling\,\,test)}{\mathop{C{{H}_{3}}COC{{H}_{3}}}}\,\] |
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