Class 12 Important Questions for Chemistry – Amines

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Here you can get Class 12 Important Questions Chemistry based on NCERT Text book for Class XII. Chemistry Class 12 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Amines for Class 12 Chemistry subject.

Chemistry Important Questions Class 12 are given below.

Multiple Choice Questions (Type-I)

  1. Which of the following is a 3° amine?
    • (i) 1-methylcyclohexylamine
    • (ii) Triethylamine
    • (iii) tert-butylamine
    • (iv) N-methylaniline
  2. The correct IUPAC name for CH2 = CHCH2NHCH3 is
    • (i) Allylmethylamine
    • (ii) 2-amino-4-pentene
    • (iii) 4-aminopent-1-ene
    • (iv) N-methylprop-2-en-1-amine
  3. Amongst the following, the strongest base in aqueous medium is ____________.
    • (i) CH3 NH2
    • (ii) NCCH2NH2
    • (iii) (CH3)2NH
    • (iv) C6H5NHCH3
  4. Which of the following is the weakest Brönsted base?
  5. Benzylamine may be alkylated as shown in the following equation :
    C6H5CH2NH2 + R—X ⎯⎯⎯⎯→ C6H5CH2NHR
    Which of the following alkylhalides is best suited for this reaction through SN1 mechanism?
    • (i) CH3Br
    • (ii) C6H5Br
    • (iii) C6H5CH2Br
    • (iv) C2H5Br
  6. Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?
    • (i) H6(excess)/Pt
    • (ii) LiAlH4in ether
    • (iii) Fe and HCl
    • (iv) Sn and HCl
  7. 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 ___________.
    • (i) Sodium amide, NaNH2
    • (ii) Sodium azide, NaN3
    • (iii) Potassium cyanide, KCN
    • (iv) Potassium phthalimide, C6H4(CO)2NK+
  8. The source of nitrogen in Gabriel synthesis of amines is _____________.
    • (i) Sodium azide, NaN3
    • (ii) Sodium nitrite, NaNO2
    • (iii) Potassium cyanide, KCN
    • (iv) Potassium phthalimide, C6H4(CO)2NK+
  9. Amongst the given set of reactants, the most appropriate for preparing 2° amine is _____.
    • (i) 2° R—Br + NH3
    • (ii) 2° R—Br + NaCN followed by H2/Pt
    • (iii) 1° R—NH2 + RCHO followed by H2/Pt
    • (iv) 1° R—Br (2 mol) + potassium phthalimide followed by H3O+/heat
  10. The best reagent for converting 2-phenylpropanamine into 2–phenylpropanamide is _____.
    • (i) excess H2
    • (ii) Br2 in aqueous NaOH
    • (iii) iodine in the presence of red phosphorus
    • (iv) LiAlH4 in ether
  11. The best reagent for converting, 2-phenylpropanamide into 1- phenylethanamine is ____.
    • (i) excess H2/Pt
    • (ii) NaOH/Br2
    • (iii) NaBH4/methanol
    • (iv) LiAlH4/ether
  12. Hoffmann Bromamide Degradation reaction is shown by __________.
    • (i) ArNH2
    • (ii) ArCONH2
    • (iii) ArNO2
    • (iv) ArCH2NH2
  13. The correct increasing order of basic strength for the following compounds is _________.
    • (i) II < III < I
    • (ii) III < I < II
    • (iii) III < II < I
    • (iv) II < I < III
  14. Methylamine reacts with HNO 2 to form _________.
    • (i) CH3—O—N = O
    • (ii) CH3—O—CH3
    • (iii) CH3OH
    • (iv) CH3CHO
  15. The gas evolved when methylamine reacts with nitrous acid is __________.
    • (i) NH3
    • (ii) N2
    • (iii) H2
    • (iv) C2H6
  16. In the nitration of benzene using a mixture of conc. H2SO4 and conc. HNO3, the species which initiates the reaction is __________.
    • (i) NO2
    • (ii) NO+
    • (iii) NO2+
    • (iv) NO2
  17. Reduction of aromatic nitro compounds using Fe and HCl gives __________.
    • (i) aromatic oxime
    • (ii) aromatic hydrocarbon
    • (iii) aromatic primary amine
    • (iv) aromatic amide
  18. The most reactive amine towards dilute hydrochloric acid is ___________.
  19. Acid anhydrides on reaction with primary amines give ____________.
    • (i) amide
    • (ii) imide
    • (iii) secondary amine
    • (iv) imine
  20. Amines
    • (i) Sandmeyer reaction
    • (ii) Gatterman reaction
    • (iii) Claisen reaction
    • (iv) Carbylamine reaction
  21. Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is
    • (i) Hoffmann Bromamide reaction
    • (ii) Gabriel phthalimide synthesis
    • (iii) Sandmeyer reaction
    • (iv) Reaction with NH3
  22. Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.
    • (i) Aniline
    • (ii) Phenol
    • (iii) Anisole
    • (iv) Nitrobenzene
  23. Which of the following compounds is the weakest Brönsted base?
  24. Among the following amines, the strongest Brönsted base is __________.
  25. The correct decreasing order of basic strength of the following species is _______.
    H2O,NH3,OH ,NH2
    • (i) NH2 > OH > NH3 > H2O
    • (ii) OH > NH2 > H2O > NH3
    • (iii) NH3 > H2O > NH2 > OH
    • (iv) H2O > NH3 > OH > NH2
  26. Which of the following should be most volatile?
    • (i) II
    • (ii) IV
    • (iii) I
    • (iv) III
  27. Which of the following methods of preparation of amines will give same number of carbon atoms in the chain of amines as in the reactant?
    • (i) Reaction of nitrite with LiAlH4.
    • (ii) Reaction of amide with LiAlH4 followed by treatment with water.
    • (iii) Heating alkylhalide with potassium salt of phthalimide followed by hydrolysis.
    • (iv) Treatment of amide with bromine in aqueous solution of sodium hydroxide.

Multiple Choice Questions (Type-II)

Note : In the following questions two or more options may be correct.

  1. Which of the following cannot be prepared by Sandmeyer’s reaction?
    • (i) Chlorobenzene
    • (ii) Bromobenzene
    • (iii) Iodobenzene
    • (iv) Fluorobenzene
  2. Reduction of nitrobenzene by which of the following reagent gives aniline?
    • (i) Sn/HCl
    • (ii) Fe/HCl
    • (iii) H2-Pd
    • (iv) Sn/NH4OH
  3. Which of the following species are involved in the carbylamine test?
    • (i) R—NC
    • (ii) CHCl3
    • (iii) COCl2
    • (iv) NaNO2 + HCl
  4. The reagents that can be used to convert benzenediazonium chloride to benzene are __________.
    • (i) SnCl2 /HCl
    • (ii) CH3CH2OH
    • (iii) H3PO2
    • (iv) LiAlH4
  5. The product of the following reaction is __________.
    • Amines
  6. Arenium ion involved in the bromination of aniline is __________.
  7. Which of the following amines can be prepared by Gabriel synthesis.
    • (i) Isobutyl amine
    • (ii) 2-Phenylethylamine
    • (iii) N-methylbenzylamine
    • (iv) Aniline
  8. Which of the following reactions are correct?
  9. Under which of the following reaction conditions, aniline gives p-nitro derivative as the major product?
    • (i) Acetyl chloride/pyridine followed by reaction with conc. H2SO4 + conc. HNO3.
    • (ii) Acetic anyhdride/pyridine followed by conc. H2SO4 + conc. HNO3.
    • (iii) Dil. HCl followed by reaction with conc. H2SO4 + conc. HNO3.
    • (iv) Reaction with conc. HNO3 + conc.H2SO4 .
  10. Which of the following reactions belong to electrophilic aromatic substitution?
    • (i) Bromination of acetanilide
    • (ii) Coupling reaction of aryldiazonium salts
    • (iii) Diazotisation of aniline
    • (iv) Acylation of aniline

Short Answer Type Questions

  1. What is the role of HNO3 in the nitrating mixture used for nitration of benzene?
  2. Why is NH2 group of aniline acetylated before carrying out nitration?
  3. What is the product when C6H5CH2NH2 reacts with HNO2?
  4. What is the best reagent to convert nitrile to primary amine?
  5. Give the structure of ‘A’ in the following reaction.
  6. What is Hinsberg reagent?
  7. Why is benzene diazonium chloride not stored and is used immediately after its preparation?
  8. Why does acetylation of —NH2 group of aniline reduce its activating effect?
  9. Explain why MeNH2 is stronger base than MeOH?
  10. What is the role of pyridine in the acylation reaction of amines?
  11. Under what reaction conditions (acidic/basic), the coupling reaction of aryldiazonium chloride with aniline is carried out?
  12. Predict the product of reaction of aniline with bromine in non-polar solvent such as CS2.
  13. Arrange the following compounds in increasing order of dipole moment.
  14. What is the structure and IUPAC name of the compound, allyl amine?
  15. A compound Z with molecular formula C3H9N reacts with C6H5SO2Cl to give a solid, insoluble in alkali. Identify Z.
  16. A primary amine, RNH2 can be reacted with CH3—X to get secondary amine, R—NHCH3 but the only disadvantage is that 3° amine and quaternary ammonium salts are also obtained as side products. Can you suggest a method where RNH2 forms only 2° amine?
  17. Complete the following reaction.
  18. Why is aniline soluble in aqueous HCl?
  19. Suggest a route by which the following conversion can be accomplished.
  20. Identify A and B in the following reaction.
  21. How will you carry out the following conversions?
    (i) toluene ⎯⎯⎯→ p-toluidine
    (ii) p-toluidine diazonium chloride ⎯⎯⎯→ p-toluic acid
  22. Write following conversions:
    (i) nitrobenzene ⎯→ acetanilide
    (ii) acetanilide ⎯→ p-nitroaniline
  23. A solution contains 1 g mol. each of p-toluene diazonium chloride and p- nitrophenyl diazonium chloride. To this 1 g mol. of alkaline solution of phenol is added. Predict the major product. Explain your answer.
  24. How will you bring out the following conversion?
  25. How will you carry out the following conversion?
  26. How will you carry out the following conversion?
  27. How will you carry out the following conversions?

Matching Type Questions

Note : Match the items of Column I and Column II in the following questions.

  1. Match the reactions given in Column I with the statements given in Column II.
  2. Match the compounds given in Column I with the items given in Column II.

Assertion and Reason Type Questions

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(i) Both assertion and reason are wrong.
(ii) Both assertion and reason are correct statements but reason is not correct explanation of assertion.
(iii) Assertion is correct statement but reason is wrong statement.
(iv) Both assertion and reason are correct statements and reason is correct explanation of assertion.
(v) Assertion is wrong statement but reason is correct statement.

  1. Assertion : Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product.
    Reason : Acyl group sterically hinders the approach of further acyl groups.
  2. Assertion : Hoffmann’s bromamide reaction is given by primary amines.
    Reason : Primary amines are more basic than secondary amines.
  3. Assertion : N-Ethylbenzene sulphonamide is soluble in alkali.
    Reason : Hydrogen attached to nitrogen in sulphonamide is strongly acidic.
  4. Assertion : N, N-Diethylbenzene sulphonamide is insoluble in alkali.
    Reason : Sulphonyl group attached to nitrogen atom is strong electron withdrawing group.
  5. Assertion : Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap and HCl in the presence of steam.
    Reason : FeCl2 formed gets hydrolysed to release HCl during the reaction.
  6. Assertion : Aromatic 1° amines can be prepared by Gabriel Phthalimide Synthesis.
    Reason : Aryl halides undergo nucleophilic substitution with anion formed by phthalimide.
  7. Assertion : Acetanilide is less basic than aniline.
    Reason : Acetylation of aniline results in decrease of electron density on nitrogen.

Long Answer Type Questions

  1. A hydrocarbon ‘A’, (C4H8) on reaction with HCl gives a compound ‘B’, (C4H9Cl), which on reaction with 1 mol of NH3 gives compound ‘C’, (C4H11N). On reacting with NaNO2 and HCl followed by treatment with water, compound ‘C’ yields an optically active alcohol, ‘D’. Ozonolysis of ‘A’ gives 2 mols of acetaldehyde. Identify compounds ‘A’ to ‘D’. Explain the reactions involved.
  2. A colourless substance ‘A’ (C6H7N) is sparingly soluble in water and gives a water soluble compound ‘B’ on treating with mineral acid. On reacting with CHCl3 and alcoholic potash ‘A’ produces an obnoxious smell due to the formation of compound ‘C’. Reaction of ‘A’ with benzenesulphonyl chloride gives compound ‘D’ which is soluble in alkali. With NaNO2 and HCl, ‘A’ forms compound ‘E’ which reacts with phenol in alkaline medium to give an orange dye ‘F’. Identify compounds ‘A’ to ‘F’.
  3. Predict the reagent or the product in the following reaction sequence.

Answers to Multiple Choice Questions

MCQ (Type I)
1. (ii) 2. (iv) 3. (iii) 4. (i) 5. (iii) 6. (ii)
7. (iii) 8. (iv) 9. (iii) 10. (iv) 11. (ii) 12. (ii)
13. (iv) 14. (iii) 15. (ii) 16. (iii) 17. (iii) 18. (ii)
19. (i) 20. (ii) 21. (ii) 22. (iv) 23. (iii) 24. (iv)
25. (i) 26. (ii) 27. (iii)
MCQ (Type II)
1. (iii), (iv) 2. (i), (ii), (iii) 3. (i), (ii) 4. (ii), (iii)
5. (i), (ii) 6. (i), (ii), (iii) 7. (i), (ii) 8. (i), (iii)
9. (i), (ii) 10. (i), (ii)

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