Nomenclature Of Special Compounds
Category : JEE Main & Advanced
Unbranched assemblies consisting of two or more identical hydrocarbon units joined by a single bond are named by placing a suitable numerical prefix such as bi for two, ter for three, quater for four, quinque for five etc. before the name of the repititive hydrocarbon unit. Starting from either end, the carbon atoms of each repititive hydrocarbon unit are numbered with unprimed and primed arabic numerals such as 1, 2, 3...., 1', 2', 3' ....., 1'', 2'', 3''..... etc. The points of attachment of the repititive hydrocarbon units are indicated by placing the appropriate locants before the name. For example,
As an exception, unbranched assemblies consisting of benzene rings are named by using appropriate prefix with the name phenyl instead of benzene. For example,
\[\underset{\text{1-Bromo-4-chlorobutane}}{\mathop{Cl\overset{4}{\mathop{C}}\,{{H}_{2}}\overset{3}{\mathop{C}}\,{{H}_{2}}\overset{2}{\mathop{C}}\,{{H}_{2}}\overset{1}{\mathop{C}}\,{{H}_{2}}Br}}\,\]\[\underset{\text{2 ethoxy-4-methoxy pentan-3-one}}{\mathop{\underset{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OC{{H}_{3}}}{\mathop{\underset{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}{\mathop{\overset{5}{\mathop{C}}\,{{H}_{3}}-\overset{4}{\mathop{C}}\,H}}\,}}\,\underset{O}{\mathop{\underset{||}{\mathop{-\overset{3}{\mathop{C}}\,-}}\,}}\,\underset{OC{{H}_{2}}C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{2}{\mathop{C}}\,H-\overset{1}{\mathop{C}}\,{{H}_{3}}}}\,}}\,}}\,\]
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