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Name the reagents used in the following ...

Name the reagents used in the following reactions:
i. Oxidation of a primary alcohol to carboxylic acid.
ii. Oxidation of a primary alchol to aldehyde.
iii. Bromination of phenol to 2,4,6-tribromonophenol.
iv. Benzyl alcohol to benzoic acid.
v. Dehydration of propan-2-ol to propene.
vi. Butan-2-one to butan-2-ol.

Text Solution

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(i) Acidified potassium dichromate or neutral/acidic/alkaline potassium permanganate.
(ii) Pyridinium dichromate `(PC C),(C_(5)H_(5)NH)+ClCrO_(3)^(-)` in `CH_(2)Cl_(2)` or Pyridinium dichromate `(PDC),[(C_(5)H_(5)NH)_(2)]^(2+)Cr_(2)O_(7)^(2)` in `CH_(2)Cl_(2)`
(iii) Aqueous bromine, i.e., `Br_(2)//H_(2)O`.
(iv) Acidified or allkaline potassium permanganate.
(v) 85% `H_(2)SO_(4)` at 440 K.
(vi) `Ni//H_(2)` or `NaBH_(4)` or `LiAlH_(4)`.
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