1. Tardigrade
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  3. Chemistry
  4. An organic compound 'A' burns with a sooty flame. It is negative towards Tollen's reagent test and positive for Borsche's reagent test. The compound 'A' is

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Q. An organic compound $'A'$ burns with a sooty flame. It is negative towards Tollen's reagent test and positive for Borsche's reagent test. The compound $'A'$ is

KCETKCET 2012Aldehydes Ketones and Carboxylic Acids

Solution:

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Since given compound ' $A$ ' burns with sooty flame, therefore it must be an aromatic compound. Again when it reacts with Borsche's reagent (acidic $2, 4$ -dinitrophenyl hydrazine solution), it yields orange precipitate. Therefore it must be a carbonyl compound, i.e., aldehyde, or ketone. But '$A$' does not perform Tollen's reagent test therefore, it must be an aromatic ketone.

Hence, ' $A$ ' is acetophenone.