Which of the following compounds is a primary amine?

Which of the following is a secondary amine is -

$1.<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\left({\mathrm{CH}}_2\right)}_2{\mathrm{NH}}_2<mspace\; width="1em"></mspace>$
$2.<mspace\; width="1em"></mspace>{\left({\mathrm{CH}}_3{\mathrm{CH}}_2\right)}_2{\mathrm{NCH}}_3<mspace\; width="1em"></mspace>$
$3.<mspace\; width="1em"></mspace>{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NHCH}}_3$
$4.<mspace\; width="1em"></mspace>{\left({\mathrm{CH}}_3\right)}_3{\mathrm{NH}}_2$

Which of the following compounds is a primary amine?

1. (CH₃)₂CHNH₂
2. CH₃(CH₂)₂NHCH₃
3. CH₃(CH₂)₂N(CH₃)₂
4. None of the above

The chemical test used to distinguish between aniline and N-methyl aniline is:

1. Carbylamine test 

2. Hoffmann bromamide reaction

3. Acetylation

4. None of above

Which of the following tests is used to distinguish aniline from benzylamine?

1. Nitrous acid.

2. Reduction Reaction

3. Hinsberg reagent

4. Lucas test

The chemical test used to distinguish between methylamine and dimethylamine is:

1. Hoffmann bromamide reaction

2. Hinsberg's reagent 

3. Carbylamine test

4. Both 2 and 3

The incorrect statement among the following is :

The incorrect statement among the following is:

C₂H₅NH₂ , C₆H₅NHCH₃, (C₂H₅)₂NH and C₆H₅NH₂ 

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

1. C₆H₅NH₂ > C₆H₅NHCH₃ > C₂H₅NH₂ > (C₂H₅)₂NH

2. C₂H₅NH₂ > C₆H₅NHCH₃ > C₆H₅NH₂ > (C₂H₅)₂NH

3. C₆H₅NHCH₃ > C₆H₅NH₂ > C₂H₅NH₂ > (C₂H₅)₂NH

4. (C₂H₅)₂NH > C₆H₅NHCH₃ > C₂H₅NH₂ > C₆H₅NH₂

The increasing order of boiling point among the given compounds is:

C₂H₅OH, (CH₃)₂NH, and C₂H₅NH₂

1. (CH₃)₂NH < C₂H₅NH₂ < C₂H₅OH

2. (CH₃)₂NH > C₂H₅NH₂ > C₂H₅OH

3. (CH₃)₂NH < C₂H₅OH < C₂H₅NH₂ 

4. (CH₃)₂NH > C₂H₅OH > C₂H₅NH₂