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How will you test aldehydes and ketones ...

How will you test aldehydes and ketones with: (i) Tollen's reagent (ii) Fehling solution Give equations.

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(i) RCHO+2[Ag(NH_3)_2]^*+30 overrarrH^* rarr RCO dotC^*+2 Ag downrarr+4 NH_3+2 H_2 O
aldeluyde .Totlen.s reagent
RCHO+2 Cu^2++5 O overlineH+RCOO^-+Cu_2 O downrarr+3 H_2 O
aldelyyde
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Monosaccharides containing an aldehyde group are called aldoses while those containing aketo group are called ketoses. The aldehyde group is always present at C_1 while the keto group is usually present at C_2 . All monosaccharides containing five and six carbon atoms have cyclic structures, furnaose (five membered) and pyranose (six membered). During ring formation, C_1 in aldoses and C_2 in ketoses becomes chiral and hence all these monosaccharides exist in two stereoisomeric forms called the alpha -anomer and the beta -anomer while C_1 and C_2 are called glycosidic or anomeric carbon atoms. In contrast, stereoisomers, which differ in configuration at any other chiral carbon other than the glycosidic carbon are called epimers. Two molecules of the same or different monosaccharides combine together through glycosidic linkage to form disaccharides. All monosaccharides (aldoses and ketoses) and most disaccharides reduce Tollens'reagent and Fehling's solution, undergo mutarotation and form osazones. Which of the following pairs give positive Tollens' test?

How will you convert : i) Benzene to toluene

Consider the following reagents, I. Br_2 water II. Tollen's reagent III. Fehling's solution Which can be used to make distinction between an aldose and a ketose?

Give reasons for the following observations. Aldehydes and ketones undergo nucleophilic addition reactions.

The pair of compounds in which both the compounds give positive test with Tollen's reagent is : glucose and sucrose, fructose and sucrose, acetophenone and hexaneal, glucose and fructose

How proton exists in aqueous solution? Give reason.

Write a test to distinguish between aldehydes and ketones.

Benzaldehyde and acetone can be best distinguished usingFehling's solution Sodium hydroxide solution 2, 4-DNP Tollens' reagent

Acid chlorides can be use to prepare aldehydes and ketones. Can you prepare acetone from acetyl chloride? Explain.

Which among the following does not give red precipitate with Fehling's solution?

V PUBLICATION-ALDEHYDES, KETONES AND CARBOXYLIC ACIDS-QUESTION BANK
  1. Suggest a method to convert a primary alcohol into an acid with one mo...

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  2. "Arrange the following in increasing order of acid strength : CICH2C...

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  3. How will you test aldehydes and ketones with: (i) Tollen's reagent (ii...

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  4. An organic compound A with molecular formula Ck H8 O. forms an' orange...

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  5. Compund X with molecular formula C9H10 O forms a semicarbazone and giv...

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  6. The compound C4 H8 Cl2 (A) an hydrolysis gives a compound C4 H8 O1(B)....

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  7. A ketone (A) which undergoes halaform reaction gives compound (B) an r...

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  8. Compound A, C4 H8O2 has the following properties. (i) It reacts with ...

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  9. A liquid (X) having molecular formula 'C6 H12 O2^*' is hydrolysed...

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  10. Compound (A) 'C6 H12 O2' an reduction with LiAl H4 yielded two c...

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  11. Complete the following reactions by identifying (A), (B) and ( C ): ...

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  12. In the Cannizzaro reaction 2 Ph+CHO overset(overset(Θ)OH) rarr Ph-CH2...

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  13. Which of the following will react with H2 O

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  14. The product obtained in a oxymercuration (HgSO4+H2 SO4) of 1 -b...

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  15. A mixture of benzaldehyde and formaldehyde on heating with aqueous NaO...

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  16. The formation of cyanohydrin from a ketone is an example of Electro...

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  17. Acetaldehyde cannot show

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  18. Which of the following does not undergo aldol condensation

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  19. The reagent with which both acetaldehyde and acetophenone react easily...

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  20. Self condensation of 2 moles of ethyl acetate in presence of sodium et...

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