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Standard XII
Chemistry
Question

2,4 DNP reacts with carbonyls (aldehyde/ketones) to give yellow ppt. This reaction is dehydration type reaction as shown above.
A mixture of benzaldehyde and formaldehyde is heated with 2,4 DNP. How many organic products will be obtained after fractional distillation?
76059_56a832d62e214fd1a9364fb5609c03ac.jpg

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Solution
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The other two are then very mirror examine products and an even mirror hydrazine coupling product.
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Similar Questions
Q1
2,4 DNP reacts with carbonyls (aldehyde/ketones) to give yellow ppt. This reaction is dehydration type reaction as shown above.
A mixture of benzaldehyde and formaldehyde is heated with 2,4 DNP. How many organic products will be obtained after fractional distillation?
76059_56a832d62e214fd1a9364fb5609c03ac.jpg
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Q2
An organic compound ′X′ forms an orange-yellow precipitate with 2,4−DNP reagent. It does not react with aqueous [Ag(NH3)2]NO3.X on reduction with NaBH4 gives a secondary alcohol and on oxidation with nitric acid yields a dicarboxylic acid containing the same number of carbon atoms. On bromination, X gives a monobromo product. On the basis of these reactions, it can be concluded that X:
I. contains aldehydic carbonyl group.
II. contains ketonic carbonyl group
III. contains ester carbonyl group
IV. does not contain C=C bonds.

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Q3
A mixture of benzaldehyde and formaldehyde on heating with NaOH solution gives :
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Q4
A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives :
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Q5
The addition reaction of enol or enolate to the carbonyl function of aldehyde or ketone is known as aldol addition. The β−hydroxyaldehyde or β−hydroxyketone so obtained undergo dehydration in second step to produce a conjugated enone. The first part of reaction is an addition reaction and the second part is an elimination reaction. Find out major product of following reaction.

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