A) n-hexane
B) n-heptane
C) iso-octane
D) n-heptane and iso-octane mixed in ratio \[50:50\]
Correct Answer: C
Solution :
Edger introduced 2, 2, 4-trimethyl pentane (iso-octane), which has higher antiknock properties, and n-heptane, which has lower antiknock properties than any commercial petrol, Iso-octane has an octane number of 100 and n-heptane has zero. The octane number of any fuel is the percentage of iso-octane in the mixture of iso-octane and n-heptane. \[\underset{iso-\text{octane}}{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-C{{H}_{3}}}}\,\] \[\underset{\text{n-heptane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}}}\,\]
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