Question

Which of the following is not correct ?
(a) Ethyl amine and aniline both have – NH₂ group
(b) Ethyl amine and aniline dissolve in HCl
(c) Ethyl amine and aniline both react with
CHCl3 and KOH to form unpleasant smelling
compound
(d) Ethyl amine and aniline both react with
HNO2 in cold to give hydroxy compounds

Answer 1

Answer:

options c is right answer of this question ..............

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Answer 2

Answer:

The answer is (d) Ethylamine and aniline both react with $HNO_{2}$ in cold to give hydroxy compounds

Explanation

The other options of this question are correct except (d)

• When ethyl amine reacts with nitrous acid and forms alcohols

• Whereas, aromatic primary amines react with nitrous acid in presence of strong mineral acid at zero temperature to give diazonium compounds. The reaction is known as Diazotisation.

      $C_{6}H_{5}NH_{2} + 2HCl + NaNO_{2}$   →  $C_{6}H_{5}N_{2}Cl + NaCl + 2H_{2}O$  

• This reaction is used to distinguish aromatic primary amines from aliphatic amines.
• Aliphatic amines do not undergo diazotization.

• The diazonium salts give colored dyes with alkaline β-Naphthol.

• Ethylamine is belong to the class of primary aliphatic amines while aniline belongs to the primary aromatic amine

• Both these compounds have $NH_{2}$ groups.

• When both these compounds can be heated with chloroform ($CHCl_{3}$ ) and alcoholic caustic potash ($KOH$) to form isocyanides, which have an extremely disagreeable odor

      $C_{2}H_{5} NH_{2} + CHCl_{3} + 3KOH$  →  $C_{2}H_{5} N=C + 3KCl +3H_{2}O$

                                                       

      $ArNH_{2} + CHCl_{3} +{3}KOH$→  $ArNC + 3KCl +3H_{2}O$                                            

• All aliphatic, as well as aromatic amines, combine with hydrogen chloride to produce salts.