C2H5NH2 , C6H5NHCH3, (C2H5)2NH and C6H5NH2 

For the above compounds, decreasing order of the pKb values (in gaseous phase) is -

1. C6H5NHC6H5NHCHC2H5NH2(C2H5)2NH

2. C2H5NH2 C6H5NHCHC6H5NH2 > (C2H5)2NH

3. C6H5NHCH3 C6H5NH2 C2H5NH2(C2H5)2NH

4. (C2H5)2NH C6H5NHCHC2H5NH2C6H5NH2

Subtopic:  Amines - Preparation & Properties |
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The increasing order of boiling point of 

 C2H5OH, (CH3)2NH, C2H5NH2 is-

1. (CH3)2NH < C2H5NH< C2H5OH

2. (CH3)2NH > C2H5NH2 > C2H5OH

3. (CH3)2NH < C2H5NH> C2H5OH

4. (CH3)2NH <  C2H5OH< C2H5NH

Subtopic:  Amines - Preparation & Properties |
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The increasing sequence of solubility of the following molecules ;C6H5NH2, (C2H5)2NH, C2H5NH 

in water is -

1. C6H5NH2 < (C2H5)2NH < C2H5NH2

2. C6H5NH2 > (C2H5)2NH < C2H5NH2

3. C6H5NH2 > (C2H5)2NH > C2H5NH2

4. C6H5NH2 < (C2H5)2NH > C2H5NH2

Subtopic:  Amines - Preparation & Properties |
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(i) Aromatic amine + Nitrous acid A(ii) Aliphatic amine  + Nitrous acid  B

The A and B in the above reactions are -

1. Alcohol, Diazonium salt

2. Aldehyde, Diazonium salt

3. Diazonium salt, Alcohol

4. Diazonium salt, Aldehyde

Subtopic:  Diazonium Salts: Preparation, Properties & Uses |
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Amines are less acidic than alcohols of comparable molecular masses because

1. N is more electronegative than O.

2. O is more electronegative than N.

3. N can accomodate negative charge easily than O

4. Amides are more stable than alcohols

Subtopic:  Amines - Preparation & Properties |
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In the conversion of nitromethane to methylamine, the reagent that is used is:

1. SOCl2
2. NaNH2
3. PCl5
4. Sn/HCl

Subtopic:  Urea & Nitro Compound |
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An aromatic compound ‘A’ on treatment with ammonia and heating forms compound ‘B’ which on heating with Br2 and KOH forms a compound ‘C’ of molecular formula C6H7N. The Substrate A is -

1. Aniline

2. Benzoic acid 

3. Benzamide

4. Benzamine

Subtopic:  Mechanism |
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A method for the identification of primary, secondary and tertiary amines is -

1) Azo-dye test

2) Carbylamine test

3) Hinsberg’s test

4) None of these

Subtopic:  Identification of Primary, Secondary & Tertiary Amines |
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Aromatic primary amines cannot be prepared by Gabriel phthalimide synthesis because -

1) Alkyl halides do not undergo electrophilic substitution with the anion formed by the phthalimide

2) Alkyl halides do not undergo nucleophilic substitution with the anion formed by the phthalimide

3) Aryl halides do not undergo nucleophilic substitution with the anion formed by the phthalimide

4) Aryl halides do not undergo electrophilic substitution with the anion formed by the phthalimide

Subtopic:  Amines - Preparation & Properties |
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C6H5N2Cl+H3PO2+H2O:

The product from the above reaction would be -

1.C6H5NC

2. C6H6CH3

3.C6H5CN

4. C6H6

 

Subtopic:  Amines - Preparation & Properties |
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