(i) Write structures of different isomeric amines corresponding to the molecular formula, C4H11N.

(ii) Write IUPAC names of all the isomers.


(iii) What type of isomerism is exhibited by different pairs of amines?

(i) & (ii) There are total 8 geometrical isomers of the given compound.



Isomers



IUPAC Name



1.





Butan-1-amine or butanamine.



2.





Butan-2-amine.



3.





2-Methylpropanamine



4.





2-Methylpropan-2-amine



5.





N-Ethylethanamine



6.





N-Methylpropanamine



7.





N-Methylpropan-2-amine



8.





N, N-Dimethylethanamine



(iii) a) Pairs 1,2,6,7 Exhibit Position isomerism; means the change in position of the substituent.


b) Pairs 1,3 and 1,4 and 2,3 and 2,4 exhibit chain isomerism i.e. in this type of isomerism the different structures can be produced by changing the chain of the atoms.


c) Pairs 5,6 and 5,7 exhibit metamerism; i.e. different group on either side of the central atom.


d) All Primary amines exhibit functional isomers. All secondary amines share functional isomerism and same for tertiary. The functional isomerism means same functional group.


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