The unripe mangoes contain ________

✅ Explanation:
Acids
-Acids are substances that taste sour. 
-It turns litmus paper red. 
-Acids are naturally present in citrus fruits like oranges, grapes, etc. 
-It is also present in the ant's sting which causes irritation. 
-Some naturally occurring acids and their source are listed in the below table.
-From, the above chart, we can see that tartaric acid is present in unripped mangoes. 
-So, the correct option is Tartaric acid.

🔴Additional Information:
Bases
-Bases are the substance that is soapy in feel and bitter in the taste.
-It turns red litmus paper into blue. 
-Baking soda, neem, clove etc are examples of bases.