[Dolphinsiu]

                       H2SO4
(CH3)2 C = CH2 ---> 2,4,4-trimethyl-1-pentene + 2,4,4-trimethyl-2-pentene
                      ----> 2,4,4-trimethyl pentane
                     H2+Ni (isooctane)

My friends hear that my lecturer say octane number = measurement in anti-locking property in oil

What does that mean for above reacton? Or my friend hear wrongly??

[Carcul]

The correct name is 2,2,4-trimethylpentane, to which is given the common name of iso-octane (in industry).
The octane number scale measures the anti-knocking properties of gasoline (the greater that number, the lower will be the tendency for gasoline to auto-detonate). In that scale, it is attributed the value 100 to iso-octane (because it has a low tendency to auto-detonate) and the value 0 to n-heptane (which has a high tendency to auto-detonate). So, a gasoline with octane number 95 for example (which is the type of gasoline that my car drinks) has a similar behavior to a mixture composed of 95% of iso-octane and 5% n-heptane.

[Dolphinsiu]

Thank you!