Amines MCQs for NEET — Chemistry Questions with Answers

(c)  Reducing character $\propto \frac{1}{\text{'}\mathrm{E}—\mathrm{H}\text{'} \mathrm{bond} \mathrm{dissociation} \mathrm{enthalpy}}$

       Hence, correct reducing character is ${\mathrm{NH}}_3<{\mathrm{PH}}_3<{\mathrm{AsH}}_3<{\mathrm{SbH}}_3<{\mathrm{BiH}}_3$.

(a) CH₃CH₂Cl$\stackrel{\mathrm{NaCN}}{\to }$CH₃-CH₂-CN $\stackrel{\mathrm{Ni}/{\mathrm{H}}_2}{\to }$ CH₃-CH₂CH₂NH₂$\underset{\mathrm{anhydride}}{\overset{\mathrm{acetic}}{\to }}$                                                                                   X                                      Y                       CH₃-CH₂-CH₂-NHCOCH₃

                                                                                                                         Z

(b) When acetamide is heated with aq. NaOH it forms NH₃ gas but ethylamine cannot form NH₃.

 CH₃CONH₂ + H₂O$\stackrel{\mathrm{NaOH}}{\to }$CH₃COONa + NH₃

CH₃CH₂NH₂ + H₂O $\stackrel{\mathrm{NaOH}}{\to }$No reaction

Basically, all Azo dyes are derivatives of aniline.

CH₃CH₂Cl $\stackrel{\mathrm{NaCN}}{\to }$$\underset{\mathrm{X}}{{\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CN}}$$\stackrel{\mathrm{Ni}/{\mathrm{H}}_2}{\to }$$\underset{\mathrm{Y}}{{\mathrm{CH}}_3-{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{NH}}_2}$$\stackrel{\mathrm{Acetic} \mathrm{anhydride}}{\to }$$\underset{\mathrm{Z}}{{\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NHCOCH}}_3}$

 CH₃CONH₂ $\stackrel{{\mathrm{P}}_2{\mathrm{O}}_5}{\to }$CH₃CN$\stackrel{4\mathrm{H}}{\to }$CH₃CH₂NH₂

(c) CH₃COOH + NH₃ $\to$CH₃COONH₄$\stackrel{∆}{\to }$CH₃CONH₂$\stackrel{{\mathrm{P}}_2{\mathrm{O}}_5}{\to }$CH₃CN

CH₃CN is ethane nitrile or acetonitrile or methyl cyanide.

Hofmann's method is used to separate primary, secondary and tertiary amines. The compound used is diethyl oxalate for this purpose.

$R{\mathrm{CH}}_2{\mathrm{NO}}_2 \stackrel{\mathrm{HOH}}{\to }R\mathrm{COOH} + {\mathrm{NH}}_2\mathrm{OH}$