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At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of O 2 for complete combustion, and 40 mL of CO 2 is formed. The formula of the hydrocarbon is :

1. C 4 H 7 Cl
2. C 4 H 6
3. C 4 H 8
4. C 4 H 10

Correct answer: C 4 H 6

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