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Alkenes undergo a variety of oxidation r...

Alkenes undergo a variety of oxidation reactions. With cold and neutral or alkaline `KMnO_(4)`, alkenes are oxidised to give vicinal diols. Oxidation with hot `KMnO_(4)` undergoes cleavage of C=C bond leading to the formation of carboxylic acids, ketones and carbon dioxide depending on the nature ofalkene. Reductive ozonolysis of alkenes give aldehydes or ketones.
But-2-ene on treatment with cold alk. `KMnO_(4)` gives

A

Butane-1, 2-diol

B

Butane-2, 3-diol

C

Ethylene glycol

D

Glyoxal

Text Solution

Verified by Experts

The correct Answer is:
B
`CH_(3)- CH =CH- CH_(3) underset(KmnO_(4))overset("cold alk")to underset("Butane-2,3-diol")(CH_(3)- underset(OH) underset(|)CH- underset(OH) underset(|)CH- CH_(3))`
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An alkene on vigorous oxidation with KMnO_(4) gives only propionic acid. The alkene is :

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Knowledge Check

  • Alkenes undergo a variety of oxidation reactions. With cold and neutral or alkaline KMnO_(4) , alkenes are oxidised to give vicinal diols. Oxidation with hot KMnO_(4) undergoes cleavage of C=C bond leading to the formation of carboxylic acids, ketones and carbon dioxide depending on the nature ofalkene. Reductive ozonolysis of alkenes give aldehydes or ketones. An alkene 'X' on treatment with hot alkaline KMnO_(4) gives acetic acid. Alkene X' is

    A
    Hex-3-enc
    B
    But-2-ene
    C
    But-1-ene
    D
    Pent-1-ene

  • Alkenes undergo a variety of oxidation reactions. With cold and neutral or alkaline KMnO_(4) , alkenes are oxidised to give vicinal diols. Oxidation with hot KMnO_(4) undergoes cleavage of C=C bond leading to the formation of carboxylic acids, ketones and carbon dioxide depending on the nature ofalkene. Reductive ozonolysis of alkenes give aldehydes or ketones. 2-Methyl propene on treatment with hot alkaline KMnO_(4) gives

    A
    `(CH_(3))_(2)CO,HCOOH`
    B
    `(CH_(3))_(2)CO,CO_(2)`
    C
    `(CH_(3))_(2)CO,CH_(3)CHO`
    D
    `CH_(3)CHO,CH_(3)CH_(2)CHO`

  • Alkenes undergo a variety of oxidation reactions. With cold and neutral or alkaline KMnO_(4) , alkenes are oxidised to give vicinal diols. Oxidation with hot KMnO_(4) undergoes cleavage of C=C bond leading to the formation of carboxylic acids, ketones and carbon dioxide depending on the nature ofalkene. Reductive ozonolysis of alkenes give aldehydes or ketones. Reductive ozonolysis of alkene 'A' gives propanone. The alkene 'A' is

    A
    2,3,-Dimethylbut-2-ene
    B
    1,4-Dimethylpent-2-ene
    C
    1,3-Dimethylbut-2-ene
    D
    2-Methylpropene

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    The compound Me_(3)C-NH_(2) on oxidation with acidic KMnO_(4) gives:

    Assertion: Terminal ulkynes on oxidation with acidic KMnO_(4) at high temperature give CO_(2) and carboxylic acids. Reason: Terminal alkynes are acidic in nature

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