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Q.

The decreasing order of the anti-knocking value of octane number of the following is:
(I) CH4 
(II) C2H6 
(III) C3H8, 
(IV) C4H10

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a

(I) > (II) > (III) > (IV)

b

(IV) > (III) > (II) > (I)

c

(I) > (III) > (II) > (IV)

d

(IV) > (II) > (III > I)

answer is A.

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Detailed Solution

As the number of C atoms increases, knocking power increases or anti-knocking power decreases.

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