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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