11th Class Chemistry Hydrocarbons

  • question_answer 3) Write IUPAC names of the following compounds : (i) \[{{(C{{H}_{3}})}_{3}}CC{{H}_{2}}C{{(C{{H}_{3}})}_{3}}\] (ii) \[{{(C{{H}_{3}})}_{2}}C{{({{C}_{2}}{{H}_{5}})}_{2}}\] (iii) Tetra-tert-butylmethane  

    Answer:

    The expanded structures of these alkanes are: (i) \[\underset{2,2,4,4-\text{Tetramethylpentane}}{\mathop{\overset{1}{\mathop{C{{H}_{3}}}}\,-{{\,}^{2}}\underset{\underset{\text{C}{{\text{H}}_{\text{3}}}}{\mathop{\text{ }\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{C}{{\text{H}}_{\text{3}}}}{\mathop{\text{ }\!\!|\!\!\text{ }}}\,}{\mathop{C}}}\,-{{\,}^{3}}C{{H}_{2}}-{{\,}^{4}}\underset{\underset{\text{C}{{\text{H}}_{\text{3}}}}{\mathop{\text{ }\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{C}{{\text{H}}_{\text{3}}}}{\mathop{\text{ }\!\!|\!\!\text{ }}}\,}{\mathop{C}}}\,-\overset{5}{\mathop{C{{H}_{3}}}}\,}}\,\] (ii) \[\underset{3,3\text{-Dimethylpentane}}{\mathop{C{{H}_{3}}-\underset{\underset{\text{C}{{\text{H}}_{\text{3}}}}{\mathop{\text{ }\!\!|\!\!\text{ }}}\,}{\overset{\overset{\overset{2}{\mathop{\text{C}}}\,{{\text{H}}_{\text{2}}}-\,\overset{\text{1}}{\mathop{\text{C}}}\,{{\text{H}}_{\text{3}}}}{\mathop{\text{ }\!\!|\!\!\text{ }}}\,}{\mathop{{{\,}^{3}}C}}}\,-\overset{4}{\mathop{C{{H}_{2}}}}\,-\overset{5}{\mathop{C}}\,{{H}_{3}}}}\,\] (iii) 3, 3-Di-tert-butyl-2, 2, 4, 4-tetramethylpentane or 3, 3-Bis (1, 1-dimethylethyl)-2, 2, 4, 4-tetramethylpentane  


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