Saturday, September 22, 2007

Questions and Answers Ch. 27 Aldehydes and Ketones

1. what are aldehydes?

They contain carbonyl group C=O as functional group and the carbonyl atom carries at least one H atom.

2. what are ketones?

In ketones, also carbonyl group C=O is the functional group. nut the carbonyl carbon does not contain any H atoms, but it is attached to two alkyl or aryl groups.

3. What is Gatterman reaction?

The Gattermann rection, named for the German chemist Ludwig Gattermann, in organic chemistry refers to a reaction of hydrocyanic acid with an aromatic compound, in this case benzene, under catalysis of with Friedel-Crafts catalyst (aluminium chloride).The reaction is similar to the Friedel-Crafts reaction.


4. How do you reduce R-COCl to an aldehyde?

By catalytic hydrogenation in the presenceof palladium (Pd) catalyst supported over barium sulphate The catalytic mixture is poisoned by the addition of a small amount of sulphur or quinoline. This reaction is known as Rosemmund reduction.

5. How do you get an aldehyde from methylbenzene?

by oxidation
6. How do you get ketone from alcohols?

By oxidation of secondary alcohols

7. What is the state of formalehyde as room temperature?

8. What is formalin?

9. Can you easily oxidize ketones?
10. Can you reduce aldehydes?
11. Can you reduce ketones?
12. What is Clemmensen reduction?
13. What is Wolff-Kishner reduction?
14. What is Cannizzaro reaction?
15. What is tollens reagent?
16.What is Fehling's solution?
17. What is Diels-Alder Reaction
18. What is Keto-Enol Tautomerism?
19 How do you get cyanohydrin from a ketone?
20. Give an example of aldol condensation.

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