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प्रश्न
What is meant by the following term? Give an example of the reaction in the following case.
2, 4-DNP-derivative
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उत्तर
When an aldehyde or ketone reacts with 2, 4-dinitrophenylhydrazine in a weak acidic medium, 2, 4-dinitrophenylhydrazone (2, 4-DNP derivative) is produced.

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संबंधित प्रश्न
Write the products formed when CH3CHO reacts with the following reagents : H2N – OH
What is meant by the following term? Give an example of the reaction in the following case.
Semicarbazone
What is meant by the following term? Give an example of the reaction in the following case.
Hemiacetal
Acetaldehyde, Acetone, Di-tert-butyl ketone, Methyl tert-butyl ketone (reactivity towards HCN)
Complete the synthesis by giving missing starting material, reagent or product.

What are amines?
Write the main product formed when propanal reacts with the following reagents:
H2N- NH2 followed by heating with KOH in ethylene glycol.
How will you convert benzoic acid to m-bromobenzoic acid?
Benzaldehyde can be obtained from benzal chloride. Write reactions for obtaining benzalchloride and then benzaldehyde from it.
Alkenes
and carbonyl compounds
, both contain a π bond but alkenes show electrophilic addition reactions whereas carbonyl compounds show nucleophilic addition reactions. Explain.
Which of the following has the most acidic hydrogen?
Write the name of product formed, when acetone is treated with 2, 4-dinitrophenyl hydrazine.
Arrange the following in the increasing order of their property indicated:
Ethanal, Propanone, Propanal, Butanone (reactivity towards nucleophilic addition)
Which will undergo faster nucleophilic addition reaction?
Acetaldehyde or Propanone

The product "P" in the above reaction is:
Why dissociation of HCN is suppressed by the addition of HCL?
The major product of the following reaction is:

