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tartaric acid
on heating the tartaric acid, the tartaric acid forms a keto acid which is known as pyruvic acid
C4H6O6 ------KHSO4/heating------> C3H4O3
(tartaric acid) (Pyruvic acid)
It is an acid, of course. That is why it is called tartaric acid.
Tartaric acid is present there. Its also present in grapes. Tartaric acid is present there. Its also present in grapes.
Yes, Tartaric acid is a compound.