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Classify the following amines as primary, secondary or tertiary:
(i)
_28-11-08_Utpal_12_Chemistry_13_9_html_m22ef5c33.jpg)
(ii)
_28-11-08_Utpal_12_Chemistry_13_9_html_74534693.jpg)
(iii) (C2H5)2CHNH2
(iv) (C2H5)2NH
Primary: (i) and (iii)
Secondary: (iv)
Tertiary: (ii)
(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) The structures and their IUPAC names of different isomeric amines corresponding to the molecular formula, C4H11N are given below:
(a) CH3-CH2-CH2-CH2-NH2
Butanamine (10)
(b) _28-11-08_Utpal_12_Chemistry_13_9_html_7665dff6.jpg){kind=small}
Butan-2-amine (10)
(c) _28-11-08_Utpal_12_Chemistry_13_9_html_67f37b10.jpg){kind=small}
2-Methylpropanamine (10)
(d)
_28-11-08_Utpal_12_Chemistry_13_9_html_m6234f5f3.jpg)
2-Methylpropan-2-amine (10)
(e) CH3-CH2-CH2-NH-CH3
N-Methylpropanamine (20)
(f) CH3-CH2-NH-CH2-CH3
N-Ethylethanamine (20)
(g)
_28-11-08_Utpal_12_Chemistry_13_9_html_2d66daee.jpg){kind=small}
N-Methylpropan-2-amine (20)
(h)
_28-11-08_Utpal_12_Chemistry_13_9_html_7f1a31c5.jpg){kind=small}
N,N-Dimethylethanamine (3°)
(iii) The pairs (a) and (b) and (e) and (g) exhibit position isomerism.
The pairs (a) and (c); (a) and (d); (b) and (c); (b) and (d) exhibit chain isomerism.
The pairs (e) and (f) and (f) and (g) exhibit metamerism.
All primary amines exhibit functional isomerism with secondary and tertiary amines and vice-versa.
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