Chapter 17 Lecture Problems 1. Which functional group is found in all aldehydes

Question

Chapter 17 Lecture Problems 1. Which functional group is found in all aldehydes and ketones? (a) carbonyl (b) carboxyl (c) hydroxyl (d) none of these 2. Which ending is used in the IUPAC names of unsaturated aldehydes? (a) -al (b nal (c) -enel (d) -enol H3 3. What is the IUPAC name of CHaCHCH2CH2CH2CH (a) 2-methylhexanal (c) 5-methylhexanal (b) 4-isopropylbutanal (d) none of these 4. What is the IUPAC name of CH3CCH2CH2CH3 (a) methyl n-propyl ketone (c) 4-pentanone (b) 2-pentanone (d) none of these 5. What is the common name of CH3CCHCH2CH3 CH3 (a) methyl isobutyl ketone (c methyl sec-butyl ketone (b) 3-methyl-2-pentanone (d) 3-methyl-4-pentanone

Explanation / Answer

1. a

2. b

3. c

4. b

5. b

6. b

7. a Aldehydes, unlike ketones, have an H atom attached to the C atom of aldehyde functional group which helps it to get oxidized

8. d Carboxylic acids are already in high oxidation state, so its difficult to oxidize them also.

9. d Ketones dont oxidize normally; they do rarely but in that case they break into two smaller chains and follow hopoffs rule i.e. the carbonyl group stays with smaller chain

10. d K2Cr2O7 is an oxidizing agent

11. c An acetal has two -OR groups attached to the same carbon atom.

12. d

13. d Can form stable cyclic hemiacetal

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