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Amines - vbncvbn

vbncvbn
Course

ORGANIC CHEMISTRY-I

38 Documents
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Academic year: 2021/2022
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Amity University

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Organic compounds containing nitrogen (IMP QUESTIONS)

SECTION A

  1. Arrange the following in increasing order of their basic strength in aqueous solution: CH 3 NH 2 , (CH 3 ) 3 N, (CH 3 ) 2 NH
  2. Arrange the following compounds in increasing order of solubility in water:C 6 H 5 NH 2 , (C 2 H 5 ) 2 NH, C 2 H 5 NH 2
  3. Arrange the following compounds in an increasing order of basic strengths in their aqueous solutions:NH 3 , CH 3 NH 2 , (CH 3 ) 2 NH, (CH 3 ) 3 N
  4. Rearrange the following in an increasing order of their basic strengths:C 6 H 5 NH 2 , C 6 H 5 N(CH 3 ) 2 , (C 6 H 5 ) 2 NH and CH 3 NH 2.
  5. The conversion of primary aromatic amines into Diazonium salts is known as?
  6. Write a chemical reaction in which the iodide ion replaces the diazonium group in a
  7. diazonium salt.
  8. Why is an alkylamine more basic than ammonia?
  9. Arrange the following in the decreasing order of their strength in aqueous solutions:CH 3 NH 2 , (CH 3 ) 2 NH, (CH 3 ) 3 Nand NH 3

SECTION B

  1. Write one chemical reaction each to illustrate the following: (i) Hoffmann’s bromamide reaction (ii) Gabriel phthalimide

  2. Identify A and B in the following :

  3. Give the chemical tests to distinguish between the following pairs of compounds: (i) Ethylamine and Aniline (ii) Aniline and Benzyl amine

  4. Describe the following giving the relevant chemical equation in each case: (i) Carbylamines reaction (ii) Hofmann's bromamide reaction

  5. Complete the following reaction equations: (i) C 6 H 5 N 2 Cl + H 3 PO 2 + H 2 O ⟶ (ii) C 6 H 5 NH 2 + Br 2 (aq.) ⟶

  6. Give reasons for the following: (i) Aniline does not undergo Friedal-Crafts reactions. (ii) (CH 3 ) 2 NH is more basic than (CH 3 ) 3 N in an aqueous solution. (iii) Primary amines have higher boiling point than tertiary amines.

  7. Arrange the following in an increasing order of (i) basic strength in water:C 6 H 5 NH 2 (C 2 H 5 ) 2 NH, (C 2 H 5 ) 3 N and NH 3 (ii) basic strength in gas phase:C 2 H 5 NH 2 (C 2 H 5 ) 2 NH, (C 2 H 5 ) 3 N and NH 3

SECTION C

  1. How will you convert the followings: (i) Nitrobenzene into aniline, (ii) Ethanoic acid into methanamine (iii) Aniline into N-phenylethanamide (write the chemical equations involved).

  2. Give reasons: (i) Acetylation of aniline reduces its activation effect. (ii) CH 3 NH 2 is more basic than C 6 H 5 NH 2. (iii) Although –NH 2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

  3. Account for the following: (i) Primary amines (R − NH 2 ) have higher boiling point than tertiary amines (R 3 N). (ii) Aniline does not undergo Friedel – Crafts reaction. (iii) (CH 3 ) 2 NH is more basic than (CH3) 3 N in an aqueous solution.

  4. Identify A, B and C in the following :

  5. Give reasons for the following (i) Acetylation of aniline reduces its activation effect. (ii) CH 3 NH 2 is more basic than C 6 H 5 NH 2. (iii) Although –NH 2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

  6. Complete the following equations:

  7. Account for the following observations: (i) pKb for aniline is more than that for methylamine. (ii) Methylamine solution in water reacts with ferric chloride solution to give a precipitate of ferric hydroxide. (iii) Aniline does not undergo Friedel-Crafts reaction.

  8. Give the structure of A, B and C in the following:

  9. Complete the following reaction

  10. Write chemical equations for the following conversion: (i) Nitrobenzene to benzoic acid. (ii) Benzyl chloride to 2 phenylethanamine. (iii) Aniline to benzyl alcohol.

  11. An aromatic compound ‘A’ of molecular formula C 7 H 7 ON undergoes a series of reactions as shown below

Write the structures of A, B, C, D and E in the following reactions 12. Write the structure of main products when aniline reacts with the following reagents: (i) Br 2 water, (ii) HCl (iii) (CH 3 CO) 2 O/pyridine. 13. Arrange the following in the increasing order of (i) their boiling point:C 2 H 5 NH 2 , C 2 H 5 OH, (CH 3 ) 3 N (ii) their basic character in an aqueous solution:C 2 H 5 NH 2 , (C 2 H 5 ) 2 NH, (C 2 H 5 ) 3 N 14. An aromatic compound ‘A’ of molecular formula C 7 H 6 O 2 undergoes a series of Reaction. Identify A, B, C, D and E

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Amines - vbncvbn

Course: ORGANIC CHEMISTRY-I

38 Documents
Students shared 38 documents in this course

University: Amity University

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Name : ÉÉÉÉÉÉÉÉÉÉÉÉ.
Organic compounds containing nitrogen (IMP QUESTIONS)
!
SECTION A
1. Arrange the following in increasing order of their basic strength in aqueous solution: CH3NH2, (CH3)3N, (CH3)2NH
2. Arrange the following compounds in increasing order of solubility in water:C6H5NH2, (C2H5)2NH, C2H5NH2
3. Arrange the following compounds in an increasing order of basic strengths in their aqueous solutions:NH3, CH3NH2, (CH3)2NH,
(CH3)3N
4. Rearrange the following in an increasing order of their basic strengths:C6H5NH2, C6H5N(CH3)2, (C6H5)2NH and CH3NH2.
5. The conversion of primary aromatic amines into Diazonium salts is known as?
6. Write a chemical reaction in which the iodide ion replaces the diazonium group in a
7. diazonium salt.
8. Why is an alkylamine more basic than ammonia?
9. Arrange the following in the decreasing order of their strength in aqueous solutions:CH3NH2, (CH3)2NH, (CH3)3Nand NH3
SECTION B
1. Write one chemical reaction each to illustrate the following:
(i) HoffmannÕs bromamide reaction
(ii) Gabriel phthalimide
2. Identify A and B in the following :
3. Give the chemical tests to distinguish between the following pairs of compounds:
(i) Ethylamine and Aniline
(ii) Aniline and Benzyl amine
4. Describe the following giving the relevant chemical equation in each case:
(i) Carbylamines reaction
(ii) Hofmann's bromamide reaction
5. Complete the following reaction equations:
(i) C6H5N2Cl + H3PO2 + H2O ⟶
(ii) C6H5NH2 + Br2 (aq.) ⟶
6. Give reasons for the following:
(i) Aniline does not undergo Friedal-Crafts reactions.
(ii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.
(iii) Primary amines have higher boiling point than tertiary amines.
7. Arrange the following in an increasing order of
(i) basic strength in water:C6H5NH2 (C2H5)2NH, (C2H5)3N and NH3
(ii) basic strength in gas phase:C2H5NH2 (C2H5)2NH, (C2H5)3N and NH3
SECTION C
1. How will you convert the followings:
(i) Nitrobenzene into aniline,
(ii) Ethanoic acid into methanamine
(iii) Aniline into N-phenylethanamide (write the chemical equations involved).
2. Give reasons:
(i) Acetylation of aniline reduces its activation effect.
(ii) CH3NH2 is more basic than C6H5NH2.
(iii) Although ÐNH2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.
3. Account for the following:
(i) Primary amines (R − NH2) have higher boiling point than tertiary amines (R3N).
(ii) Aniline does not undergo Friedel Ð Crafts reaction.
(iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.

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