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Name the reagents I the following reactions: (i) Oxidation of a primary alcohol to a carboxylic acid (ii) Oxidation of a primary alcohol to an aldehyde. (iii) Bromination of phenol to 2,4,6-tribromophenol. (iv) Benzyl alcohol to benzoic acid (v) Dehydration of propan-2-ol to propene (vi) Butan-2-one to butan-2-ol. |
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Answer» <P> Solution :(i) Acidified potassium DICHROMATE or, neutral, acidic or alkaline potassium PERMANGANATE (followed by hydrolysis with dil. `H_(2)SO_(4)`)(ii) Pyridinium chlorochromate `(P C C),C_(5)H_(5)NH^(+)CrO_(3)Cl^(-)` in `CH_(2)Cl_(2)`. or Pyridinium dichromate `(PDC)," "(C_(5)H_(5)overset(+)(NH))_(2)Cr_(2)O_(7)^(2-)` in `CH_(2)Cl_(2)`. (iii) Aqueous bromine, i.e., `Br_(2)//H_(2)O`. (iv) Acidified or alkaline potassium permanganate (followed by hydrolysis with dil. `H_(2)SO_(4)`) (v) 85% `H_(2)SO_(4)` at 440K. (vi) `Ni//H_(2)` or `NaBH_(4)` or `LiAlH_(4)`. |
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