Amines Mock Test – Class 12 Chemistry

1. Assertion: Benzenediazonium chloride and azobenzene are different classes of compounds.
Reason: Benzenediazonium chloride contains the ionic group , whereas azobenzene contains a neutral linkage between two phenyl groups.

2. Which statement best expresses the limitation of the common rule that ortho-substituted anilines are less basic than their para isomers?

3. The IUPAC name of is:

4. In an important resonance contributor of aniline formed by donation of the nitrogen lone pair into the benzene ring:

5. Complete conversion of a methylamine–propan--amine mixture gives the corresponding -acetyl derivatives. The total product mass is . Each mole of amine gains during acetylation. Using amine molar masses and , respectively, the amounts of methylamine and propan--amine are:

6. Which decreasing basicity order is most reasonable?

7. Benzenediazonium chloride is prepared from aniline by treating it with:

8. The conjugate acid of aniline does not receive the same lone-pair resonance stabilisation as neutral aniline because, after protonation:

9. An aqueous extract contains of ethylammonium chloride and of excess hydrochloric acid. It is treated with of sodium hydroxide. Given and , the final is approximately:

10. Which substrate is expected to react most readily with potassium phthalimide through an pathway?

11. Three routes begin with -bromobutane.
Route P: reaction with excess alcoholic ammonia.
Route Q: reaction with potassium phthalimide followed by hydrolysis.
Route R: reaction with followed by nitrile reduction.
Which conclusion is correct?

12. Three compounds are listed below.
Compound P:
Compound Q:
Compound R:
The pair in which the nitrogen lone pair can interact directly with the benzene -system is:

13. At , a weak-amine solution has . Taking , the approximate is:

14. In an ordinary bond of an amine, the appropriate partial-charge pattern is ______.

15. Assertion: -Chloroaniline is generally less basic than aniline.
Reason: The negative inductive effect of chlorine lowers electron density at nitrogen, and this effect outweighs its resonance donation in the basicity comparison.

16. Assertion: Nitrous acid is usually generated within the reaction mixture during diazotisation of aniline.
Reason: Nitrous acid is unstable and is conveniently produced from sodium nitrite and hydrochloric acid immediately before it reacts.

17. Replacement of the diazonium group by a nitro group can be achieved at recognition level by treating a suitable arenediazonium species with:

18. Resonance donation from the amino group of aniline increases electron density most directly at the:

19. Aliphatic diazonium ions decompose much more readily than arenediazonium ions mainly because:

20. Assertion: Gabriel synthesis does not directly prepare a secondary amine.
Reason: Cleavage of an -alkylphthalimide releases a compound of the form .

21. Assertion: Protonation generally decreases the nucleophilicity of an amine nitrogen.
Reason: The lone pair used for nucleophilic attack becomes part of the new nitrogen–hydrogen bond.

22. Assertion: Sulphanilic acid is commonly represented as a zwitterion in the solid state.
Reason: A proton is transferred from the strongly acidic sulphonic acid group to the basic amino group, giving and groups.

23. A freshly purified aromatic amine is colourless but gradually becomes darker on standing in air. The most reasonable explanation is:

24. An unknown amine gives a positive carbylamine test. In a separate experiment, it reacts with benzenesulphonyl chloride, and the product dissolves in excess alkali but precipitates after acidification. Which conclusion is justified?

25. Benzamide is treated successively with , cold , and . The principal final product is:

26. Use the following passage.
An unknown amine reacts with benzenesulphonyl chloride in aqueous alkali and produces a neutral solid. The solid remains unchanged and insoluble when more alkali is added. Acidification of the mixture produces no new precipitate because the solid was never converted into a soluble salt.
The unknown amine is most likely:

27. An organic mixture of mass contains aniline and a neutral compound. The aniline is completely extracted as its hydrochloride, regenerated with base, and isolated. The recovered aniline has a mass of , corresponding to an overall recovery. The original mass percentage of aniline and the minimum volume of hydrochloric acid required for extraction are:

28. An sample of propan-1-amine is treated with of sulphuric acid. Complete formation of is assumed. The mass of salt formed and the mass of unreacted propan-1-amine are:

29. In the balanced overall equation

the missing coefficient of is:

30. Replacing the lone pair of a neutral amine by a bond pair during protonation generally causes the bond angles around nitrogen to:

31. Consider the following statements about nitrile reduction.
Statement I: can reduce a nitrile to a primary amine.
Statement II: Catalytic hydrogenation may also convert a nitrile into a primary amine.
Statement III: The nitrile carbon is lost during the reduction.
Select the applicable combination.

32. When aniline is added to bromine water at room temperature, the characteristic observation is:

33. Amide reduction and nitrile reduction are similar in that:

34. Assertion: The sulphonamide formed from a secondary amine remains insoluble when excess aqueous alkali is added.
Reason: The sulphonamide contains no nitrogen-bonded hydrogen that can be removed by the alkali.

35. Why should odour alone not be used to identify an unknown amine?

36. A name written as “methylethylamine” is being converted to the preferred common-name order. The suitable repair is:

37. Examine the hydrogen-bonding descriptions below.

The valid row is:

38. A mixture of aniline and nitrobenzene is shaken with dilute hydrochloric acid. Which separation procedure is correct?

39. Aniline is converted into acetanilide, brominated under controlled conditions, hydrolysed, diazotised, and finally treated with . The principal final product is:

40. Four bases have the following values at the same temperature. Which is the strongest base?

41. Examine the reaction records below.

The valid row is:

42. Match each factor in Column I with its principal effect in Column II.

43. When a haloalkane is present in large excess relative to ammonia, the product distribution is pushed most strongly toward:

44. In the secondary-amine Hinsberg reaction, the missing product is identified from:

45. Two weak amines are compared at equal initial concentration and temperature. Amine X has , while amine Y has . The most appropriate conclusion is:

46. Addition of can reduce the electrophilic-substitution reactivity of aniline because:

47. Examine the formulas below.

The valid rows are:

48. Two nitrogen compounds are described below.
Compound P contains a phenyl group bonded to , together with a tetrafluoroborate counter-ion. Compound Q contains two phenyl groups joined through .
The names of P and Q, respectively, are:

49. For the equilibrium

the base-dissociation constant is:

50. The square-root approximation for a amine solution with gives . Which assessment is correct?