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Give the decreasing order of the octane ...

Give the decreasing order of the octane rating of the following:
i.

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The tendency of knocking in the decreasing order is: stright-chain alkane gt branched-chain alkane gt alkenes gt cyclo alkane gt aromatic hydrocarbons. The ocatane rating is reversed, therefore, the decreasing order of ocatane rating is
(vi) gt (v) gt (iv) gt (iii) gt (ii) gt (i)
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