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STD 11 - 9. Hydricarbon — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 9. Hydricarbon4 Marks
MCQ
The reference compound `iso-octane' which is used in determining the octane number of gasoline has the structure
  • A
    $C{H_3} - CH(C{H_3}) - CH(C{H_3}) - CH(C{H_3}) - C{H_3}$
  • ✓
    $C{H_3} - C{(C{H_3})_2} - C{H_2} - CH(C{H_3}) - C{H_3}$
  • C
    $C{H_3} - C{(C{H_3})_2} - CH(C{H_3}) - C{H_2} - C{H_3}$
  • D
    $C{H_3} - C{(C{H_3})_2} - C{(C{H_3})_2} - C{H_3}$
✓

Answer

Correct option: B.
$C{H_3} - C{(C{H_3})_2} - C{H_2} - CH(C{H_3}) - C{H_3}$
b
The octane number of gasoline is a way of knocking down its resistance. The characteristics of octane number one gasoline are compared by isoacetane ($2,2,4$-trimethylparnane) and heptane. Isooctane is assigned an octane number of $100$ . It is a highly branching compound that burns easily, with little knock.

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