| List 1 | List 2 |
| Organic acids | Substances in which they are present |
| A. Lactic acid | 1. Lemon |
| B. Acetic acid | 2. Rancid butter |
| C. Citric acid | 3. Milk |
| D. Butyric acid | 4. Vinegar |
| 5. Wine |
Answer: 3 4 1 2
Notes: • Lactic acid is found primarily in sour milk products, such as koumiss, laban, yogurt, kefir, and some cottage cheeses.
• Vinegar is 5% acetic acid. Acetic acid is a compound that, when pure, is water clear and freezes just above room temperature.
• Lemon juice and lime juice are rich sources of citric acid, containing 1.44 and 1.38 g/oz, respectively.
• Butyric acid is a fatty acid occurring in the form of esters in animal fats. The triglyceride of butyric acid makes up 3–4% of butter.
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