13.AMINES Objective

14.AMINES

1. Nitrogen atom of amino group is ……….. hybridised.

(A) sp
(B) sp²
(C) sp³
(D) sp³d

2. The most convenient method to prepare primary (i Amine) amine containing one carbon atom less is

(A) Gabriel phthalmidie synthesis
(B) Reductive amination of aldehydes
(c) Hofmann bromamide reaction
(D) Reduction of isonitriles

3. When excess of ethyl iodide is treated with ammonia, the product is

(A) ethylamine
(B) diethylamine
(C) triethylamine
(D) tetrathylammonium iodide

4. Secondary amines can be prepared by

(A) reduction of nitro compounds
(B) oxidation of N-substituted amides
(C) reduction of isonitriles
(D) reduction of nitriles

5. Amine that cannot be prepared by Gabriel- Phthalmidie synthesis is

(A) aniline
(B) benzyl amine
(C) methyl amine
(D) iso-butylamine

6. Which of the following amines will give carbylamine reaction ?

(A) (C₂H₅)₃N
(B) (C₂H₅)₂NH
(C) C₂H₅NH₂
(D) C₃H₇NHC₂H₅

7. Arrange the following compounds in increasing order of basicity :

CH₃NH₂, (CH₃)₂ NH, NH₃, C₆H₅NH₂

(A) C₆H₅NH₂ < NH₃ < (CH₃)₂NH < CH₃NH₂
(B) CH₃NH₂ < (CH₃)₂NH < NH₃ < C₆H₅NH₂
(C) C₆H₅NH₂ < NH₃ < CH₃NH₂ < (CH₃)₂NH
(D) (CH₃)₂NH < CH₃NH₂ < NH₃ < C₆H₅NH₂

8. Which of the following species are involved in the carbylamine test ?

(i) RNC
(ii) CHCl₃
(iii) COCl₂
(iv) NaNO₂ + HCl

(A) (i) and (iv)
(B) (i) and (ii)
(C) (ii) and (iv)
(D) (ii) and (iii)

9. Identify ‘Z’ in the sequence ?

C₆H₅NH₂

(A) C₆H₅CN
(B) C₆H₅CONH₂
(C) C₆H₅COOH
(D) C₆H₅CH₂NH₂

10. Which of the following is used as Hinsberg’s reagent ?

(A) C₆H₅SO₂Cl
(B) C₆H₅SO₃H
(C) C₆H₅NHCH₃
(D) C₆H₅COCH₃

11. Among the compounds C₃H₇NH₂, CH₃NH₂, C₂H₅NH₂ and C₆H₅NH₂. Which is the least basic compound ?

(A) CH₃NH₂
(B) C₂H₅NH₂
(C) C₃H₇NH₂
(D) C₆H₅NH₂

Product would be

13. Most basic species amongst the following is

14. When aniline is heated with conc. H₂SO₄ at 455-475 K, it forms

(A) aniline hydrogensulphate
(B) sulphanilic acid
(C) amino benzene sulphonic acid
(D) benzenesulphonic acid

15. Which of the following compounds reacts with NaNO₂ and HCl at 0-4°C to give alcohol/ phenol ?

(A) C₆H₅NH₂
(B) C₂H₅NH₂
(C) CH₃NHCH₃
(D) C₆H₅NHCH₃

16. Which of the following has highest pK_b value ?

(A) (CH₃)₃CNH₂
(B) NH₃
(C) (CH₃)₂NH
(D) CH₃NH₂

17. Acetylation of a secondary amine in alkaline medium yields

(A) N, N-dialkyl acetainide
(B) N, N-dialkyl amine
(C) N, N-dialkyl amide
(D) acetyl dialkyl amine

18. When p-toluidine reacts with chloroform and alcoholic KOH, then the product is

19. Among the following:

I. CH₃NH₂
II. (CH₃)₂NH
III. (CH₃)₃N
IV. C₆H₅NH₂

Which will give the positive carbylamine test ?

(A) I and II
(B) I and IV
(C) II and IV
(D) II and III

20. Cyclohexylamine is stronger base than aniline become

(A) in aniline electron pair is involved in conjugation
(B) in cyclohexylamine electron pair is involve conjugation
(C) in aniline-NH₂ group is protonated
(D) in cyclohexylamine nitrogen has a negative charge

21. The strongest base among the following is

(A) C₆H₅NH₂
(B) p-NH₂C₆H₄NH
(C) m-NO₂C₆H₄NH₂
(D) C₆H₅CH₂NH₂

22. Among the following the weakest base is

(A) CH₃NHCHO
(B) C₆H₅CH₂NH₂
(C) NO₂CH₂NH₂
(D) C₆H₅CH₂NHCH₃

23. o-Chloroaniline is treated with a mixture of NaNO₂ and HCl and the product is reacted with cuprous bromide. The final product in the reaction will be

24. In diazotisation reaction with NaNO2 and HCI an excess of HCl is used to

(A) suppress the formation of acetanilide
(B) suppress the concentration of free aniline available for coupling
(C) maintain the pH of the reaction
(D) prevent the formation of anilinium ion

25. The correct IUPAC name for CH2 = CHCH2NHCH3 is

(A) allylmethylamine
(B) 2-amino-4-pentene
(C) 4-aminopent-1-ene
(D) N-methylprop-2-ene-1-amine

26. Benzylamine may be alkylated as shown in the following equation :

C₆H₅CH₂NH₂ + R – x → C₆H₅CH₂NHR + HX

Which of the following alkyl halides is best suited for this reaction through S_N1 mecha-nism ?

(A) CH₃Br
(B) C₆H₅Br
(C) C₆H₅CH₂Br
(D) C₂H₅Br

27. Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine ?

(A) H₂ (excess)/Pt
(B) LiAlH₄ in ether
(C) Fe and HCl
(D) Sn and HCl

28. In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH₂ group in the carbon chain, the reagent used as source of nitrogen is

(A) sodium amide, NaNH₂
(B) sodium azide, NaN₃
(C) potassium cyanide, KCN
(D) potassium phthalimide, C₆H₄(CO)₂N^–K⁺

29. Amongst the given set of reactants, the most approp. for preparing 2° amine is

(A) 2° R – Br + NH₃
(B) 2° R – Br + NaCN followed by H₂/Pt
(C) 1°R – NH₂ + RCHO followed by H₂/Pt
(D) 1° R – Br (2 mol) + potassium phthalimide followed by H₃O⁺ / heat

30. The correct increasing order of basic strength for following compounds is

(A) II < III <I
(B) III < I< II
(C) III < II <I
(D) II < I < III

31. The gas evolved when methylamine reacts with nitrous acid is

(A) NH₃
(B) N₂
(C) H₂
(D) C₂H₆

32. Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is

(A) Hofmann bromamide reaction
(B) Gabriel phthalmide synthesis
(C) Sandmeyer reaction
(D) Reaction NH₃

33. Which of the following compounds will not undergo azo coupling reaction with benzene dianonium chloride ?

(A) Aniline
(B) Phenol
(C) Anisole
(D) Nitrobenzene

34. Aniline reacts with Acetaldehyde to form

(A) Carbylamines
(B) Nitrogenzene
(C) Imine
(D) Schifs base

35. Imprical formulae of benzene is

(A) CH
(B) C₂H₂
(C) C₆H₆
(D) None

Class 12th Chemistry Objective Question English