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Carbohydrates are organic compounds composed of carbon, hydrogen and oxygen where the last two are in the ratio of 2 : 1 same as in water (H₂0). A carbohydrate is an organic compound which is broken down to release energy. Carbohydrates are represented by a general formula C_nH_2nO_n. For example, C₆H₁₂O₆ or glucose is an carbohydrate.