Question 14 Marks
What happens when primary, secondary and tertiary alcohols are:
(i) Oxidised using acidified potassium permanganate.
(ii) Passed over heated copper at 570 K.
(i) Oxidised using acidified potassium permanganate.
(ii) Passed over heated copper at 570 K.
Answer
View full question & answer→(i) Oxidation of $1^{\circ}, 2^{\circ}, 3^{\circ}$ alcohols by alkaline potassium permangnate
$1 ^{\circ}$ Alcohol :
$RCH _2 OH \xrightarrow[\text { [O] }]{ \text {Acidic} KMnO_4} RCHO \xrightarrow{[ O ]} RCOOH$
$2 ^{\circ}$ Alcohol :
$R _2 CHOH \xrightarrow{[ O ]}$$RCOR \xrightarrow{[ O ]} RCOOH$
$3^{\circ}$ Alcohol :
Do not oxidise with acidic $KMnO _4$.
(ii) When passed over heated copper at 570 K .
Primary Alcohol :
$RCH _2 OH \xrightarrow[570 K]{ Cu } RCHO + H _2$
Secondary Alcohol :
$1 ^{\circ}$ Alcohol :
$RCH _2 OH \xrightarrow[\text { [O] }]{ \text {Acidic} KMnO_4} RCHO \xrightarrow{[ O ]} RCOOH$
$2 ^{\circ}$ Alcohol :
$R _2 CHOH \xrightarrow{[ O ]}$$RCOR \xrightarrow{[ O ]} RCOOH$
$3^{\circ}$ Alcohol :
Do not oxidise with acidic $KMnO _4$.
(ii) When passed over heated copper at 570 K .
Primary Alcohol :
$RCH _2 OH \xrightarrow[570 K]{ Cu } RCHO + H _2$
Secondary Alcohol :
