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A gaseous hydrocarbon gives upon combustion 0.72 g. of water and 3.08 g. of CO 2 . The empirical formula of the hydrocarbon is -

1. C 6 H 5
2. C 7 H 8
3. C 2 H 4
4. C 3 H 4

Correct answer: C 7 H 8

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