A sample of petroleum contains 30% n-heptane, 10% 2-methyl hexane and 60% 2, 2, 4-trimethyl pentane, the octane no. of this sample will be;
(1) 30%                    (2) 60%                   (3) 10%                     (4) 70%

Dear Student,

2,2,4-trimethylpentane is also called as iso-octane.
The octane number of iso-octane is taken as octane number of fuel. 
So, 60% iso-octane will have octane number = 60%

Therefore, octane number of fuel = 60%

Hence, correct answer is (2)

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