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Which of the following element has 100% anti knocking?

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Which of the following element has 100% anti knocking?

(a) 2-methyl naphthalene

(b) heptadecane

(c) CH3-(-CH2-)14-CH3

(d) 3-methyl naphthalene

This question was posed to me in an online quiz.

My query is from Cracking and Knocking of Petroleum in division Fuel Technologies of Applied Chemistry

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Right answer is (c) CH3-(-CH2-)14-CH3

Explanation: CH3-(-CH2-)14-CH3 has the 100% anti knocking value. It is also called as n-hexa decane. The lowest anti knocking value that is 0 is for the element 2-methyl naphthalene.

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