Iso-octane reacts with oxygen:

Endothermically

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Exothermically

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Only some activation energy is required

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Doesn't react

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Solution

The correct option is B Exothermically
$2, 2, 4 -$ trimethylpentane (isooctane), widely used in gasoline, has a chemical formula of $C_{8} H_{8}$ and it reacts with oxygen exothermically as shown below:
$2 C_{8} H_{18} (l) + 25 O_{2} (g) ⟶ 16 C O_{2} (g) + 18 H_{2} O (g)$

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