Dẫn `1,68` lít hỗn hợp khí `X` gồm `2` hiđrocacbon vào bình đựng dung dịch brom (dư). Sau khi phản ứng xảy ra hoàn toàn, có `4` gam brom đã phản ứng và còn lại `1,12` lít khí. Nếu đốt cháy hoàn toàn `1,68` lít `X` thì sinh ra `2,8` lít khí `CO_2`. Biết các thể tích khí đều đo ở đktc. Tìm công thức phân tử của `2` hiđrocacbon. (Giải chi tiết + k copy 👌)

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