Name the reagents used in the following reactions : (i) Oxidation of a primary alcohol to carboxylic acid, (ii) Oxidation of a primary alcohol to 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.

Name the reagents used in the following reactions : (i) Oxidation of

1.	Name the reagents used in the following reactions : (i) Oxidation of a primary alcohol to carboxylic acid, (ii) Oxidation of a primary alcohol to 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.
Answer» Solution :(i) Acidified postassium dichromate or, neutral, acidic or alkaline postassium permanganate. (II) Pyridinium chlorochromate `("PCC"), C_(5)H_(5)overset(+)NHClCrO_(3)^(-)" in "CH_(2)Cl_(2)` or Pyridinium dichromate `("PDC"),(C_(5)H_(5)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. (v) Conc. `H_(2)SO_(4)` at 433 - 443 K or `85%` phosphoric acid at 443 K. (vi) `Ni//H_(2) or NaBH_(4) or LiAlH_(4)`.