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Sunday, November 19, 2023
Wednesday, November 1, 2023
REASONING QUESTIONS ORGANIC CHEMISTRY
1. Before nitration aniline is converted into acetanilide
2. Aryl halides can not be prepared by the reaction of phenol with hydrogen halides.
3. Sulphuric acid is not used during the reaction of alcohols with KI.
4. The haloalkanes are only very slightly soluble in water
5. Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as the chief product.
6. Although chlorine is an electron withdrawing group, yet it is ortho-, para- directing in electrophilic aromatic substitution reactions.
7. The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
8. Grignard reagents should be prepared under anhydrous conditions.
9. p-dichlorobenzene has higher melting point than those of o- and m- isomers.
10. COH bond angle in alcohols is slightly less than the tetrahedral angle.
11. The C-O bond length in phenol is slightly less than that in methanol.
12. Tertiary alcohols do not under go oxidation reaction.
13. Ortho and para nitrophenols are more acidic than phenols.
14. Bimolecular dehydration of alcohols is not appropriate for the preparation of ethyl methyl ether.
15. Alkyl aryl ethers when react with HX yields phenol and alkyl halide not aryl halide and alcohol.
16. Propanol has higher boiling point than that of the hydrocarbon, butane.
17. o-nitro phenol is steam volatile while p-nitrophenol is not.18. o-nitro phenol os more acidic than ortho methoxyphenol
19. Boiling point of ethanol is higher than that of methoxymethane.
20. Carboxylic acids are stronger acids than phenols.
21. Aromatic carboxylic acids do not under go Friedel-Crafts reaction.
22. Cyclohexanone forms cyanohydrin in good yield but 2,2,6-trimethylcyclohexanone does not.
23. There are two –NH2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
24. During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.
25. Although phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol.
26. Anline does not undergo Friedel-Crafts reaction.
27. pKb of aniline is more than that of methylamine.
28. Ethylamine is soluble in water whereas aniline is not.
29. Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.
30. Although amino group is o- and p- directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.
31. Diazonium salts of aromatic amines are more stable than those of aliphatic amines.32. Gabriel phthalimide synthesis is preferred for synthesizing primary amines.
33. Aromatic primary amines cannot be synthesized by Gabriel phthalimide synthesis.
34. Amines are les acidic than alcohols of comparable molecular masses.
35. Primary amines have higher boiling point than tertiary amines.
36. Aliphatic amines are stronger bases than aromatic amines.
37. Aromatic ammines are less basic than aliphatic ammines.
38. Ammonolysis of alkyl halide does not give corresponding ammines in pure state.
39. If NO2 or COOH groups are attached to a carbon of benzene ring electrophilic substitution becomes difficult.
40. Haloalkane undergo nucleophilic substitution reaction.
41. Alcohol act as a weak base.
42. Phenol exhibit acidic behavior.
43. Ether possess dipole moment even alkyl groups are identical.
44. Carboxylic acids have high boiling point than alcohols of comparable molecular mass.
45. Aldehydes are more reactive than ketones towards Nucleophilic reagents.
46. Boiling points of ether are lower than isomeric alcohols.
47. Acetic acid is weaker than chloroacetic acids.
48. Electrophilic substitution reaction in benzoic acids takes place at meta-position
49. Alkyl ammines are stronger base than Aryl ammines
50. Like ammonia ammines are good nucleophiles.
51. Toluene is more readily nitrated than benzene
52. Unlike alcohols ,phenols cannot be easily protonated.
53. Why do aldehydre/ketone behave like polar compounds?
54. Haloarenes are insoluble in water but soluble in benzene
55. Formaldehyde gives cannizzaro reaction whereas acetaldehyde not
56. Carboxylic acid do not give the characteristic test of carbonyl group
57. Carbonyl compound shows nucleophillic addition reaction.
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CARBON AND ITS COMPOUNDS-Functional Group
1. Name the functional groups present in the following compounds. a) CH 3 – CO –CH 2 –CH 2 –CH 2 –CH 3 b) CH...