Question

Which of the following compound will not give benzoic acid
on oxidation with KMnO₄/OH⊕/∆–
(a) C₆H₅ – CH₃
CH₃
|
(b) C₆H₅ - C - CH₃
|
CH₃
CH₃
(c) C₆H₅ – CH
CH₃
(d) C₆H₅ – CH₂ – COOH

Answer 1

Explanation:

When we type only option it won't be accepted and to type is too difficult

Answer 2

Option 3 is the correct option.

Explanation:

• The potassium permanganate is an alkaline solution is a strong oxidising agent.

• This reagent is a strong oxidiser which oxidises an alkyl group attached with the benzene to benzoic acid.

• This reagent only works on 1° and 2° alkyl chain.

• This is because it needs an alpha hydrogen to work.

• So a 3° alkyl chain won't work with this reagent.

For more information about KMnO4,

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Dilute solution of alkaline potassium permanganate is known as_____A) Bayer's reagent B) Tollen's reagent C)Fehling solution D) Benedict Solution

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Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction.(b) when concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas hcl, but if the mixture contains bromide then we get red vapour of bromine. Why?