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A ketone gives a yellow precipitate, whe...

A ketone gives a yellow precipitate, when treated with `I_(2)`in an alkaline solution. Thus, the ketone is :

A

A cyclic ketone

B

A methyl ketone

C

An unsaturated ketone

D

None of these

Text Solution

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The correct Answer is:
B
`CH_(3)COCH_(3)+3I_(2) overset(NaOH)underset("Iodination")rarr underset(alpha,alpha,alpha-"Triodo acentone")(CI_(3)COCH_(3))+3HI`
`CI_(3)COCH_(3)+ NaOH overset("Hydrolysis")rarr underset("Iodoform")(CHI_(3))darr + underset("Sodium acetate")(CH_(3)COONa)`
Due to the formation of Iodoform in this reaction, it is known as Iodoform test.
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ERRORLESS -ALDEHYDES AND KETONES -Ordinary Thinking (Objective Questions) Properties
  1. Which is most reactive of the following ?

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  2. Which of the following does not undergo Cannizzaro's reaction ?

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  3. A ketone gives a yellow precipitate, when treated with I(2)in an alkal...

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  4. The order of susceptibility of nucleophilic attack on aldehydes follow...

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  5. OHC-CHOoverset(OH^(-))toHOH(2)C-COOH. The reaction given is

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  6. HCHO and HCOOH are detected by

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  7. Which can undergo haloform reaction ?

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  8. underset(aq.)(3HCHO) overset("cooled")hArr X.X is

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  9. An aromatic compound 'X' with molecular formula C(9)H(10)O gives the f...

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  10. Aldehydes and ketones give addition reaction with

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  11. Only an aldehyde having….can undergo the aldol condensation

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  12. Identify the organic compound which on heating with strong solution of...

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  13. Benzaldehyde and acetone can be best distinguished using ……..

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  14. The correct sequence of steps involved in the mechanism of cannizzaro'...

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  15. An organic compound 'A' burns with a sooty flame. It is negative towar...

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  16. Methyl ketones are usually characterised through

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  17. Which of the following compounds is most reactive towards nucleophilic...

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  18. To distinguish between 2-pentanone and 3-pentanone which reagent can b...

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  19. The dipeptide Gln-Gly on treatment with CH(3)COCI followed by aqueous ...

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  20. The most stabl enol tautomer of MeCOCH(2)CO(2)Et is

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