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Benzaldehyde gives a positive test with ...

Benzaldehyde gives a positive test with Tollen's reagent but not with Fehling's and Benedict solutionws. Why ?

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It id due to stronger oxidizing nautre of Tollen's reagent as compared to Fehling and Benedict's solution and cannot oxidise benzaldehyde to benzoic acid. In genera, all these three can oxidise aliphatic aldehydes.
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CBSE COMPLEMENTARY MATERIAL-ALDEHYDES,KETONES AND CARBOXYLIC ACIDS-SHORT ANSWER -I TYPE QUESTIONS (2 MARKS)
  1. Which acid of each pair shown here would you expect to be stronger ? C...

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  2. Which acid of each pair shown here would you expect to be stronger ? .

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  3. Carboxylic acids do not give reactions of aldehydes and ketones why ?

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  4. Write IUPAC name of the following : .

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  5. Write IUPAC name of the following : .

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  6. Accout for the following : (i) Oxidation of toluence to C(6)H(5)CHO wi...

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  7. Accout for the following : (ii) Melting point of an acid with even num...

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  8. Distinguish between : (i) C(2)H(5)OH and CH(3)CHO.

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  9. Distinguish between : (ii) C(6)H(5)COCH(3) and C(6)H(5)CH(2)CHO.

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  10. Complete the following reactions by identitying A: A+ "Hydrogen" (g)...

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  11. Compelte the following reactions by identifying B and C: (ii) CH(3)-ov...

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  12. Benzaldehyde gives a positive test with Tollen's reagent but not with ...

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  13. Aldehydes usually do not form stable hydrates but chloral normally exi...

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  14. Give possible explanation for the following : (i) Cyclohexanone forms ...

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  15. Give possible explanation for the following : (ii) There are two - NH2...

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  16. Aldehydes are easily oxidisable yet propanal can conveniently br prepa...

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  17. Do the following conversions in not more than two steps. (i) Benzoic a...

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  18. Write the reactions involved in the following reactions: (i) Clemmen...

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  19. Convert the following (i) Ethyl benzene to benzoic acid

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  20. Convert the following (ii) Ethanal to but-2-enal.

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