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.

Question

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Answer 1

(i) Oxidation of primary alcohol to carboxylic acid.
Acidified $K_{2} C r_{2} O_{7}$ or acidified $K M n O_{4}$

(ii) Oxidation of primary alcohol to aldehyde.
Pyridinium chlorochromate (PCC) in $C H_{2} C l_{2}$ or Pyridinimium dichromate (PDC) in $C H_{2} C l_{2}$

(iii) Bromination of phenol to 2,4,6-tribromophenol.
Aqueous bromine ( or bromine water)

(iv) Benzyl alcohol to benzoic acid.
Acidified or alkaline $K M n O_{4}$ followed by hydrolysis with dil $H_{2} S O_{4}$

(v) Dehydration of propan-2-ol to propene.
85% phosphoric acid

(vi) Butan-2-one to butan-2-ol.
$N a B H_{4}$ or $N i / H_{2}$

Answer 2

(i) Oxidation of primary alcohol to carboxylic acid.
Acidified

K_{2} C r_{2} O_{7}

or acidified

K M n O_{4}

(ii) Oxidation of primary alcohol to aldehyde.
Pyridinium chlorochromate (PCC) in

C H_{2} C l_{2}

or Pyridinimium dichromate (PDC) in

C H_{2} C l_{2}

(iii) Bromination of phenol to 2,4,6-tribromophenol.
Aqueous bromine ( or bromine water)

(iv) Benzyl alcohol to benzoic acid.
Acidified or alkaline

K M n O_{4}

followed by hydrolysis with dil

H_{2} S O_{4}

(v) Dehydration of propan-2-ol to propene.
85% phosphoric acid

(vi) Butan-2-one to butan-2-ol.

N a B H_{4}

or

N i / H_{2}