Iso-octane is mixed with petrol:

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(D) Iso-octane is a branched alkane ($2,2,4$-trimethylpentane) used as a reference standard to measure the antiknock quality of gasoline. It is assign

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As an antiknock agent

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(D) Iso-octane is a branched alkane ($2,2,4$-trimethylpentane) used as a reference standard to measure the antiknock quality of gasoline. It is assigned an octane rating of $100$,while $n$-heptane is assigned $0$. Mixing iso-octane with petrol helps in reducing the knocking tendency of the fuel,thereby acting as an antiknock agent.

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