Carbohydrates in acidic stomach
As for the digestion of fats there are two digestive enzymes active in the stomach:


Lingual lipase (produced with saliva)
Gastric lipase (produced in the stomach chief cells)


Both have activity optima in the acidic pH range.

On the other hand, the salivary amylase that breaks down starch seems to be inactivated by the acidic environment. 

Sources:


https://www.ncbi.nlm.nih.gov/pubmed/2134569
https://en.wikipedia.org/wiki/Gastric_lipase
https://en.wikipedia.org/wiki/Lingual_lipase
https://en.wikipedia.org/wiki/Alpha-amylase