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CBSE Class 12-science Answered

Conversion of amines   
Asked by Sudamkalgunde624 | 31 Dec, 2019, 11:38: AM
Expert Answer

Conversion of Amines:   

1. Acylation reaction

  • Aliphatic and aromatic primary and secondary amines (which contain replaceable hydrogen atoms) react with acid chlorides, anhydrides and esters to form substituted amide.
  • The process of introducing an acyl group (R–CO–) into the molecule is called acylation.
  • The reaction is carried out in the presence of a stronger base than the amine, such as pyridine, which removes HCl formed and shifts the equilibrium to the product side.
 
2. Carbylamine reaction
  • On heating aliphatic and aromatic primary amines with chloroform and ethanolic KOH they form isocyanides or carbylamines which have foul odour.
  • Secondary and tertiary amines do not show this reaction.
  • This reaction is used as a test for primary amines.

       

Answered by Varsha | 31 Dec, 2019, 03:30: PM

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sir/madam, this doubt will be lenghty. request peace reading. the doubt is w.r.t chapter Amines; to be specific it is w.r.t basicity of amines. in the topic of the comparision of the basic character of alkylamines with ammonia,  the order of basicity of amines is tertiary> secondary> primary in gaseous phase, only due to the +I effect. in gasous phase only +I effect is shown? also in the aqueous phase, the disturbancy in the order of basicity is due to the sum of effects of +I effect, solvation effect and steric hindrance? the order of the stability of the following in aqueous phase: +I effect: tertiary> secondary> primary solvation: primary > secondary > tertiary steric hindrance: primary > secondary > tertiary so does it means that +I is effected in both gaseous and aqueous phase but solvation and steric hindrance are effected only in aqueous phase? also sir there is an order of basicity when R= CH3 group and when R= C2H5 group: R= CH3: secondary> primary> tertiary R= C2H5: secondary> tertiary> primary so sir can we generalise the order that: when R=CH3 group, the order of basicity: secondary> primary> tertiary and when R> CH3 group, the order of basicity: secondary> tertiary> primary
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