Urea on slow heating gives :

• NH₂CONHNO₂

• NH₂CONHCONH₂

• HCNO

• NH₂CONH₂.HNO₃

The correct sequence of base strengths in aqueous solution is :

• (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N

• (CH₃)₃N > CH₃NH₂ >(CH₃)₂NH

• (CH₃)₃N > CH₃NH₂ = (CH₃)₂NH

• (CH₃)₂NH > (CH₃)₃N > CH₃NH₂ 

When aqueous solution of benzene diazoniumchloride is boiled, the product formed is:

• C₆H₅CH₂OH

• C₆H₆ + N₂

• C₆H₅COOH

• C₆H₅OH

Carbylamine reaction is given by aliphatic :

• primary amine

• secondary amine

• tertiary amine

• quaternary ammonium salt

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHO} \stackrel{ {\mathrm{NH}}_3}{\to } ?$

• $({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHN}{)}_2\mathrm{CH}·{\mathrm{C}}_6{\mathrm{H}}_5$

• C₆H₅NHCH₃

• C₆H₅NHCH₂

• C₆H₅NHC₆H₅

An organic compound 'A' having molecular formula C₂H₃N on reduction gave another compound B, upon treatment with nitrous acid 'B' gave ethyl alcohol. On warming with chloroform and alcoholic KOH, it formed an offensive smelling compound 'C'. The compound 'C' is

• CH₃CH₂NH₂

• CH₃CH₂N$\overrightarrow{=}$ C

• CH₃C$\equiv \mathrm{N}$

• CH₃CH₂.OH

Compound (A) (molecular formula C₃H₈O) is treated with acidified potassium dichromate to form a product B (molecular formula C₃H₆O). 'B' forms a shining silver mirror on warming with ammoniacal silver nitrate. 'B' when treated with an aqueous solution of H₂NCONHNH₂ · HCl and sodium acetate gives a product C'. Identify the structure of 'C

• ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH} ={\mathrm{NNHCONH}}_2$

• $({\mathrm{CH}}_3{)}_2\mathrm{C} = {\mathrm{NNHCONH}}_2$

• $({\mathrm{CH}}_3{)}_2\mathrm{C} ={\mathrm{NCONHNH}}_2$

• ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}= {\mathrm{NCONHNH}}_2$

The decreasing order of basic characters of the three amines and ammonia is

• NH₃ > CH₃NH₂ > C₂H₅NH₂ > C₆H₅NH₂

• C₂H₅NH₂ > CH₃NH₂ > NH₃ > C₆H₅NH₂

• C₆H₅NH₂ > C₂H₅NH₂ > CH₃NH₂ > NH₃ 

• CH₃NH₂ > C₂H₅NH₂ > C₆H₅NH₂ > NH₃ 

59.

Benzene diazonium chloride on treatment with hypo phosphorus acid and water in presence of Cu⁺ catalyst produce

• benzene

• toluene

• aniline

• chlorobenzene

Which of the following reagents will be fruitful for separating a mixture of nitrobenzene and aniline?

• aq. NaHCO₃

• H₂O

• aq. HCl

• aq. NaOH