Carcinogens are the products of the reaction between:

1.  ${\mathrm{R}}_2\mathrm{NH}+{\mathrm{HNO}}_2$

2.  ${\mathrm{R}}_3\mathrm{N}+{\mathrm{HNO}}_2$

3.  ${\mathrm{RNH}}_2+{\mathrm{HNO}}_2$

4.  none of these 

Hofmann's rearrangement During the conversion of an amide to amine involves ..... rearrangement.

1.  Intermolecular

2.  Intramolecular

3.  Both (1) and (2)

4.  None of the above 

Aniline is a weaker base than ethylamine because:

1. lone pair of electrons of N-atom is not freely available for coordination due to resonance than in ethylamine.

2. Its b.p. is higher than that of ethylamine.

3. It does not produce a sufficient concentration of ${\mathrm{OH}}^{-}$ ions in solution.

4. It is insoluble in water while ethylamine is soluble in water.

Diethyl carbonate on heating with ammonia gives:

1.  ${\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{NH}}_2$

2.  ${\left({\mathrm{C}}_2{\mathrm{H}}_5\right)}_{3}N$

3.  ${\left({\mathrm{C}}_2{\mathrm{H}}_5\right)}_{2}NH$

4.  Urea

Nitroalkane is acidic only towards:

1.  ${\mathrm{Na}}_2{\mathrm{CO}}_3$

3.  $\mathrm{NaOH}$

3.  alcohol

4.  liquid ${\mathrm{NH}}_3$

Primary, secondary, and tertiary amines may be separated by using:

1.  Ethanoyl chloride 

2.  Diethyl oxalate

3.  Thionyl chloride

4.  None of the above

The name urea was given by:

1. Wohler

2. Berzelius

3. Roulle

4. Lemery

Urea when heated a white residue is formed. Its alkaline solution when treated with few drops of ${\mathrm{CuSO}}_4$ solution gives:

1. Red colour

2. Violet colour

3. Green colour

4. Yellow colour

The diamide of carbonic acid is:

(1) acetamide

(2) formamide

(3) benzamide

(4) urea

The basic character of methylamines in vapour phase is:

(1) $3°>2°>1°>N{H}_3$

(2) $2°>3°>1°>{\mathrm{NH}}_3$

(3) $1°>2°>3°>{\mathrm{NH}}_3$

(4) None of these