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Carboxylic group (−COOH)
The noble gases.
COOH (carboxyl) groups are found on compounds called carboxylic acids, which are organic compounds that contain a carboxyl group. NH2 (amino) groups are found on compounds called amines, which are organic compounds that contain an amino group. Both carboxylic acids and amines are commonly found in various biological molecules and have important functions.
If you mean the hydroxyl functional group (-OH), then only serine and threonine contain it. However, all amino acids contain one or more carboxylic acid (-COOH) functional groups and they all contain OH as part of that functional group, though the carboxylic acid functional group should be considered a single unit.
The Actinoids group contain all the synthetic elements. All the elements that have an atomic weight of 95 and above do not occur naturally. They are part of the actinoid elemental group.
Since each of these molecules contain an -OH group, ethanoic acid exhibits hydrogen bonding.
Citric acid comes from fruits, mainly... And gluten is found in grain-based products. In the States citric acid is pretty much made from corn. "Well over 90% of the citric acid produced in the U.S. is made via the fermentation of corn-derived glucose or dextrose, according to The Freedonia Group. Elsewhere, the feeds include wheat-derived sugars, cane sugar, sugar beets and molasses." http://www.purchasing.com/article/CA624878.html
Carboxylic group (−COOH)
COOH
COOH
They are found in algae.In plankontons,they are in unicellular algae.
This is also written as: CH3-COOH ...and is known as acetic acid, or ethanoic acid. It is composed of a methyl group and a carboxyl group.
Carboxyl
Pantothenic acid (B5)
The noble gases.
Carboxyl
Generally group 18 is considered to contain non-reactive gases. But some compounds of xenon, krypton and radon are found.