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  4. Which compound has octane number 100?

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Q. Which compound has octane number 100?

Rajasthan PETRajasthan PET 2004

Solution:

2,2,4-trimethyl pentase is also called iso-octane. Its octane number is 100. $ \underset{2,2,\text{ }4-trimethyl\text{ }pentane}{\mathop{\underset{1}{\mathop{C}}\,{{H}_{3}}-\underset{\begin{smallmatrix} |2 \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-\underset{3}{\mathop{C}}\,{{H}_{2}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{\underset{4}{\mathop{C}}\,H}}\,-\underset{5}{\mathop{C}}\,{{H}_{3}}}}\, $