Home
Class 12
CHEMISTRY
When t-butanol and n-butanol are separat...

When `t`-butanol and `n`-butanol are separately treated with a few drops of dilute `KMnO_(4)` in one case only, the purple colour disappears and brown precipitate is formed. Which of the two alcohols gives the above reaction and which is the brown precipitate?

Text Solution

Verified by Experts

t-butanol is not oxidised with dil. `KMnO_(4)`, so it does not give brown precipitates. n-butanol is oxidised with dil. `KMnO_(4)`, so it is able to disappear the purple colour of `KMnO_(4)` and to give the brown precipitate of `MnO_(2)`.
`3CH_(3)-CH_(2)-CH_(2)-CH_(2)OH+2KMnO_(4) rarr3CH_(3)-CH_(2)-CH_(2)-CHO+underset("brown ppt. ")(2MnO_(2)darr) + 2KOH+2H_(2)O`
Promotional Banner

Topper's Solved these Questions

  • ALCOHOLS, PHENOLS & ETHERS

    VMC MODULES ENGLISH|Exercise Example|20 Videos

  • ALCOHOLS, PHENOLS & ETHERS

    VMC MODULES ENGLISH|Exercise PRACTICE EXERCISE:1|21 Videos

  • 13-14 HYDROGEN & S-BLOCK ELEMENT

    VMC MODULES ENGLISH|Exercise JEE Advanced Archive|48 Videos

  • ALCOHOLS, PHENOLS & ETHERS

    VMC MODULES ENGLISH|Exercise Impeccable|100 Videos

Similar Questions

Explore conceptually related problems

When a crystalline compound X is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , a reddish brown gas A is evolved. On passing A into caustic soda, a yellow solution of B is formed. A yellow precipitate of C is obtained when a solution B is neutralised with acetic acid and then treated with a lead acetate solution. when X is heated with NaOH , a colourless gas is evolved which, when passed into a solution of K_(2)[HgI_(4)] , gives a reddish brown precipitate of D. ltBrgt Q. Which of the following is the composition of the brown precipitate (D) ?

Gradual addition of KI solution to Bi(NO_3)_(3) solution initially produces a dark brown precipitate which dissolves in excess of KI to give a clear yellow solution. Write chemical equation for the above reactions.

Gradual addition of KI solution to Bi(NO_3)_(3) solution initially produces a dark brown precipitate which dissolves in excess of KI to give a clear yellow solution. Write chemical equation for the above reactions.

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with diolute H_(2)SO_(4) , boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) . concentratd H_(2)SO_(4) is added to the resulting solution. a brownn ring is formed at the junction of the two layers. Q. A solution of A, when treated with NH_(3) , gives:

A chemist opened a cupboard and found four bottles containing water solutions, each of which had lost its label.Bottles 1,2,3 contanied colourless solution, while bottle 4 contained a blue solution.The labels from the bottles were lying scattered on the floor of the cupboard.They were: copper (II) sulphate, Hydrochloric acid lead nitrate , Sodium carbonate By mixing samples of the contents of the bottles, in pairs , the chemist made the following observations : Bottle 1 +Bottle 2 to White precipitate is formed. Bottle 1 +Bottle 3 to White precipitate is formed. Bottle 1 +Bottle 4 to White precipitate is formed. Bottle 2 +Bottle 3 to Colourless and odourless gas is evolved. Bottle 2 +Bottle 4 to No visible reaction is observed. Bottle 3 +Bottle 4 to Blue precipitate is formed. With the help of the above observations answer the following questions. Which one of the following bottles develops deep blue with aqueous ammonia ?

Identify the cations in each of the following cases : (i) NaOH solution when added to the Solution (A) gives a reddish brown precipitate. (ii) NH4OH Solution when added to the Solution (B) gives white precipitate which does not dissolve in excess.

p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound X is

p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound Y is

p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound Z is

A white solid P, on strong heating, decomposes to give reddish brown gas R and a residue Q. The residue Q is yellow when hot and white when cold. The solution of white solid P in water gives white precipitate S, with concentrated sodium hydroxide. The white precipitate S dissolves in excess of sodium hydroxide solution to form colourless solution. Another sample of the solid P in water is mixed with ferrous sulphate solution and then to this solution are added a few drops of conc. sulphuric acid. A brown ring is formed at the junction of liquids. Answer the following questions: Name the white precipitate S.