Câu 4: Khi đốt cháy hoàn toàn 2,24 lít một hiđrocacbon X mạch hở thu được 6,72 lít khí CO2 ( các khí được đo ở đktc) và 5,4 gam H2O. Công thức phân tử của X là A. C3H6 B. C5H10 C. C5H12 D. C4H8 Bài 5: Khi đốt cháy hoàn toàn một hiđrocacbon A mạch hở, thu được 2,24 lít khí CO2 ( khí được đo ở đktc) và 0,9 gam H2O. Công thức phân tử của A là trường hợp nào sau đây? A. C3H4 B. C5H10 C. C2H2 D. C4H6 Bài 6: Ba hiđrocacbon X, Y, Z kế tiếp nhau trong dãy đồng đẳng, trong đó khối lượng phân tử Z gấp đôi khối lượng phân tử X. Đốt cháy 0,1 mol chất Y, sản phẩm khí hấp thụ hoàn toàn vào dung dịch Ca(OH)2 (dư), thu được số gam kết tủa là (cho H = 1, C = 12, O = 16, Ca = 40) A. 30. B. 10. C. 20. D. 40.

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